[aptivaa12]

1997, Lumina, 3100
History of the vehicle is not known until 106,000 when I purchased it. I bought it from my grandmother but she did'nt keep records. Has ran fine until 120,000 miles. Regular maintainance, no engine light but it does work. Only symptoms are ocassional problems which is while accelerating it hesitates significantly, up or downhill, or at higher rpm's while idle. I cannot pinpoint whether it is during hot or cold weather. Car does'nt have a Tach so dont know the RPM'S it does it at. And it does it only after the engine seems to have warmed up and only above 35 mph. The engine appears to die while driving or idleing if you press on the accelerator half way or more. Does not appear to happen every time but becoming more common. In the last month I have put a new battery, alternator, harmonic balancer, fuel filter, air filter on it. But that was just for regular maintainance. I have'nt done any troubleshooting for this other than taking it to autozone to make sure there was no codes lurking without lighting up the check engine light. Any help would be greatly appreciated.