Every morning or when I use my truck i put it on drive I press on the gas and the engine will rev up but the truck goes very slow

Every morning or when I use my truck i put it on drive I press on the gas and the engine will rev up but the truck goes very slow after a while of pressing on the gas it starts going but when im at a stop it hesitates to go same thing happens when I go reverse.

My car has 138980 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. I have a couple of ideas. You mentioned it happens in the morning and this indicates the truck is cold. When the seals in a transmission get old and hard, they allow ATF to leak internally and the transmission cannot build enough pressure to move your car forward. Once the car warms, the seals soften and seal. This will affect every gear, including reverse.

I assume, when you say the motor revs, you have a tachometer and the RPM’s rise but the car does not match speed. If this is the case, then the above explanation still applies. If you don’t have a tachometer, but the motor just makes a loud noise as if it were revving high, this is most likely the fan clutch pulling more air through the radiator. This will make a very loud rushing sound that sounds very much like the motor is revving high. It may be that the motor is not running well when cold and lacks power.

Either way, you should have one of our qualified technicians check it out. They can come to your car’s location to test the vehicle and diagnose the loss of power symptoms.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The Dodge Ram acceleration problems are usually caused by a dirty or faulty throttle body, mass airflow sensor, or oxygen sensor. Other potential causes include issues with the fuel system, engine, or transmission. In some cases, a simple cleaning of the throttle body may be all that`s needed to fix the problem.
There are several potential causes of engine hesitation on acceleration. These include a dirty or faulty throttle body, a slipping transmission, low tire pressure, bald tires, or a faulty traction control system. An idle air control valve may also be a potential cause.
Fuel injectors may become dirty over time and not be able to provide as much fuel to the cylinder as is needed. Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating.
When you press down the accelerator pedal and get minimal output, it could mean you have a problem with your fuel system. The most probable issue is a clogged fuel filter. Your fuel filter works to ensure that dirt and debris do not get into the fuel system.
The oxygen sensor problem is the number one reason cars are slow to accelerate. The oxygen sensor is responsible for monitoring the air-to-fuel ratio in the engine, and over time it can become dirty or damaged, which will decrease power. Oxygen sensor malfunction will result in a mixture being too lean.
Accelerometer sensors have the ability to alter obtained physical acceleration from motion or gravity into a voltage output. Accelerometers are widely used to measure inert acceleration due to gravity, the low-frequency module of the acceleration and the dynamic acceleration due to animal movement [36].
Culprits include a dirty fuel filter, clogged fuel tank strainer, clogged or failing fuel injectors, or a defective fuel pump. On most vehicles replacing the fuel filter is a DIY operation.
Culprits include a dirty fuel filter, clogged fuel tank strainer, clogged or failing fuel injectors, or a defective fuel pump. On most vehicles replacing the fuel filter is a DIY operation.
Fuel lines, dirty air filters, and throttle body issues can all cause a delayed throttle response. You can avoid this issues by installing a Throttle Response Controller. Engine response time will be improved, and you`ll enjoy driving your car more.
Culprits include a dirty fuel filter, clogged fuel tank strainer, clogged or failing fuel injectors, or a defective fuel pump. On most vehicles replacing the fuel filter is a DIY operation.
The most typical causes of a car not accelerating while driving include a faulty sensor, contaminated fuel or air filters, or a faulty timing belt. Generally, this isn`t something you should ignore.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Every morning or when I use my truck i put it on drive I press on the gas and the engine will rev up but the truck goes very slow
ANSWER : Hello. I have a couple of ideas. You mentioned it happens in the morning and this indicates the truck is cold. When the seals in a transmission get old and hard, they allow ATF to leak internally and the transmission cannot build enough pressure to move your car forward. Once the car warms, the seals soften and seal. This will affect every gear, including reverse.

I assume, when you say the motor revs, you have a tachometer and the RPM’s rise but the car does not match speed. If this is the case, then the above explanation still applies. If you don’t have a tachometer, but the motor just makes a loud noise as if it were revving high, this is most likely the fan clutch pulling more air through the radiator. This will make a very loud rushing sound that sounds very much like the motor is revving high. It may be that the motor is not running well when cold and lacks power.

Either way, you should have one of our qualified technicians check it out. They can come to your car’s location to test the vehicle and diagnose the loss of power symptoms.

Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.

Alternator glowing red hot. The engine don’t rev up in drive, but revs up fine in park. Whats going on?
ANSWER : Hi there. What happened is the voltage regulator in the alternator failed. The battery died due to the alternator not putting the voltage back into the battery, but instead it cooked the battery with a higher voltage than the battery could handle. I recommend replacing the alternator and the battery.

If you need further assistance with the battery going dead, then seek out a professional, such as one from Your Mechanic, to help you.

The engine of the car runs, but when I push the gas pedal it does not accelerate, and the engine does not rev.
ANSWER : Hello. It sounds like you may have an issue with your throttle position sensor. This sensor sends a reference voltage to your power-train control module, which uses that to determine ignition timing and fuel trims. If the power-train control module is not detecting the proper signal from the throttle position sensor, the engine may not accelerate properly. It’s probably a good idea for you to have a professional mobile mechanic come to your location and complete a car is slow to accelerate inspection first, so they can pinpoint what is causing this issue to occur and they will recommend the right repairs be completed.

Transmission was low. Put 4 quarts in it and everything was fine until next morning shifting to drive and felt like neutral
ANSWER : If the fluid was 4-5 quarts low, that’s a third of the total transmission fluid capacity. The transmission has probably been running very hot because of that, causing accelerated wear to the internals (clutches, etc). Check the dipstick for the correct fluid type to use. Ford transmissions are very fussy about using the correct fluid type. You can try a full transmission fluid service by replacing the fluid and filter, not a "trans flush". You might get lucky and have that solve your problem, but odds are with being driven with the fluid that low, a transmission rebuild may be the only solution.

I have a 2004 Dodge Ram quad cab with a 5.7 liter 8 cylinder engine. When I put truck in 4 wheel drive and move I hear a clucking.
ANSWER : Hi there. The noise that you are hearing could be either the front axle engagement solenoid or the gear lash on the pinion and ring gear on the front axle could be too much. Check to see if the front axle engagement solenoid is making the noise. If it is, then the solenoid may be broken or loose. If the solenoid is working good, then you will have to check the gear lash on the front differential with a dial indicator and the front cover off with the fluid drained. If you need further assistance with the clunking noise when you put your truck in 4WD, then seek out a professional, such as one from Your Mechanic, to help you.

If I put my car in drive and push on the gas it wont shift to second unless I let off the gas. If I drive it in overdrive it shift
ANSWER : Hello, the concern you have I strongly advise not to drive. The issue needs to be addressed, the vehicle will become inoperable. The automatic transmission has 3 systems; electronic, hydraulic, and mechanical. What describe could be an internal mechanical failure with transmission. The electrical system which includes the module, will go into a default mode if there is a failure with it. This mode allows forward gears and reverse depending on what has failed. If you’d like, a certified Your Mechanic Technician can come to your location to verify what type of failure the transmission has. Please look at this web site for more information and service options.
transmission inspection

My truck won’t allow me to change gears even when pressing the clutch. No gears go in at all. Makes it impossible to drive.
ANSWER : Hello, this concern is possibly the slave or clutch master cylinder failure. These two components use brake fluid to apply pressure for movement of the clutch system. This fluid breaks down in time and causes the seals to fail (leak). A low fluid level would cause this concern as well as internal leakage. Replacement of components would be necessary. This type of concern would need to be inspected. If you’d like, a certified technician from YourMechanic can come to your location to diagnose your vehicle, and possibly replace your clutch master cylinder if need be.