When the truck is in nuetral and I press the gas pedal it hesitates. idles perfect. changed the throttle positioning sensor and it didn't make a difference. When I put it in drive and press the gas pedal it hesitates. It is worse with the air cond. on. The warmer the truck gets the worse it runs and will even stall at low speed.
My guess is a compression problem - which could be caused by something simple and cheap to fix or as serious as a new head gasket.
SOURCE: running rich and stalls.
Sounds like it is most likely a sensor in your intake system, either mass airflow, air temperature, or map sensor. Autozone and Advance both pull the codes on your truck for free. I have a 93 Eclipse that did the same thing with a hole in the intake tube, so check that too. Hope this helps :)
SOURCE: Car idles fine but will
We need to know more about what car and engine you have, but the primary suspect is that the timing belt has slipped and things are out of time.
SOURCE: I changed the throttle body
I would check the idle control valve. First make sure it is plugged in all the way. Sometimes they look plugged in but push on the plug just to be sure. If it is in all the way it might be bad. Some can be taken out and cleaned with carb and choke cleaner or brake and part cleaner but others have to be replaced. The idle control valve is right next to the Throttle Position Sensor. Hope that helps. Good Luck!
SOURCE: I change the fuel fiter and the idel positioning
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