I have a 1999 Pontiac Firebird with 107k miles on it. I've had this car since it was new and have been lucky to have had very few problems. However, after the car heats up (after driving for 5-10 minutes), the car will hesitate during acceleration and sometimes die at idle. I have replaced plugs, wires, fuel filter and fuel pump and it is still doing this. I would love some advice from anyone out there who has experienced this or has an idea of what it might be.

 

My firebird is having the same issue and we've replaced fuel pump, fuel filter, plugs, wires, coil packs, and the ignition control module. It doesnt overheat, but when the engine gets warm or the temperature gets to the operating temp, it struggles to run. As soon as you let off the gas pedal or have to brake or slow down, it dies, until it sits and what i assume cools off, it doesnt startup and run good. Can someone please help me figure out what this underlying issue is?!?!?!

 

i wouldnt be able to help you but im experiencing a similar problem lost pcm communication and that didnt start until after i changed the throttle body and the app on the throttle pedal and now it has lost communication with the pcm initially when i bought the car it drove i drove it for a week just thought it would be a good idea to tell you my issues and that could be a place to start and check

 

CHeck the map sensor. Mine did same and i was told to replace map.It worked