1qkws6

O.K. this may be the wrong site but I need some help. My wifes 01 grand am GT is having some issues that I can't figure out. The S.E.S. light was on and throwing a code of PO135, but just put in a new o2 sensor and light or code hasn't came back on. But the car still seems to stumble under acceleration in any gear, but only after the engine temp. is 200, but revs just fine in neutral. I have changed the fuel filter, o2 sensor as said, and transmisson filter. So if anyone has seen this problem please reply.

ghardester

Is that the 3800 Series II V-6? Change the plug wires first. Had 2 of them and wires went out on both. And the problem first shows up when engine is under a load. And probably won't when reving in neutral. And/or check the 3 coil pack, one might be blown. Not real expensive but the spark system in the 3800 did cause me some grief. I'm not certain, but if I had the car, I would be reasonably sure that changing the wires would solve the problem.

1qkws6

It's the 3.4L but I will give that a try.

1qkws6

For all of you that were working so hard to help me figure this out you can quit now because it was the MAP sensor.

ghardester

Thanks for letting us know what the solution was. Some just drop the thread and you never know. This forum is good for education and I always like to hear the answer. Saved me a bunch of money reading here.