Hello guys,
I have a 2004 grand prix with 103000 miles on it with the 3.8 engine. First of all the problem is that the car had a hard time to accelerate on load (its stuffering a lot over 3500rpm). After that when it pass from 4 to 3 (when it's close to 45 mph) if the car is on low rpm (1100 or close to that) and climbing a hill or just pressing a little more de gaz pedal the car will start to sometimes stuffering. But if i press more on gaz the car shift and there is no problems. if the trans change gear at higher rpm i will not have this problem.
Next i have no engine light but i alredy had a p0455 and p0496 and never came back and i did nothing to fix that (it's winter here and last time a had a p0455 the winter took it away and i dont know why) i have an engine support that is damaged (the engine lean to the left when you are in front of the car) and i found a 2 pin plug coming from the tranny that is unpluged. i don't know if it may have a link with my problem but now you know what the state of my car.
Next i cleaned the pcv valve and i replaced the 3 coils with the controller with a used one i had on hand. Its helped a lot on the accelerration problem but it looks like it could be better.
And now for the tranny i don't know what to do.. is it a problem with the engine, ignition, electronics or the tranny? a lock-up swich maybe?
thanks a lot for your helps guys
