hi guys, i need your help on this one please, i have a 05 cavalier 2.2L. the car has an issue at the take off ( especially if i step in the gas pedal all the way, it actually turns off) it has a really slow take off but after it has gain some speed its fine. now ive change map sensor, the cat, fuel filter, tps sensor, fuel valve pressure, air control sensor, spark plugs, and the sensor that is locate in the intake pipe ( its a very small one). even the dealer told me that it was the cat and map sensor and still doing the same thing. oh, i check the alternator and its good. if any of you guys have any idea on what it can be please i would really be greatful with you guys.

 

Might try cleaning the maf sensor with approved cleaner.

 

but i got i new sensor now. and no check engine light.

 

anyone else please...

 

I had a similar problem with my 2.2L. I changed out most of the same things you did, but it turned out to be the fuel pump. A pain to replace, but it fixed it. Maybe a fuel pressure test is in order. Good luck!

 

i just did the fuel pressure test, its pushing 60 and when i press the botton on it its drops it to 30. i think thats a good pump right?

 

would be nice to know some fuel trim data and injector pulse rate info

auto or manual trans?

 

Could be a problem with your torque convertor (in an automatic)