L4-2.0L,Map sensor car won’t start up good ?

My CEL code in my rsx type s flashes 5 indicating that my (MAP) sensor manifold absolute pressure sensor is whats wrong. my car hesitates to start sometimes won't start at all if I changed the map sensor will the car start up new what to do ? I checked the spark plugs and cleaned them properly help please the only problem with the car is starting up once started up the car drives fine it's starting the car is was difficult it sometimes will leave me stranded but the car never stalled on me it just I gotta hold the key on for the car to keep cranking and start

My car has 128543 mil