Thread: accelorating problem

I have a 2000 grand prix se with a 3.1. When I push the gas peddle more then half way or mash on it it bogs down once it gets to 3500rpm. It like it wants to go but it don't. I've replace the throtale postion sensor, plugs and wires, fuel filter, added Lucas injetor cleaner, Intake cleaner. Afetr all this it seemed to help some but the problem still exists. Now I can push the peddle to the floor it will go then it will bog down if I eas up slightly then push it down again it will clear out and go just fine. Anyone have any input. I'm running out of ideas here.

Also having issues with the fuel gauge. 9 out of 10 times it reads full. When indeed theres a half of a tank the other 10th of a time it reads empty. Turn car off start it back up it will read full. Bad ground??? I've replaced the dash cluster with no luck. Gauge may fluxuate from time to time otherwise its full or empty. Any input would greatly be appreciated.

CEL is off hasn't tripped since replacing the throtule postion sensor. It was the same code every time according to Auto Zone and they said the CEL came on for one of the following: Front O2 sensor, week cooling fan, low fuel line pressure. The ruled the low fuel line pressure out cause it runs fine under 3500 rpm. Just got back from the back pressire test and they say cat is fine.

As far as the fuel gauge it's crazy. Says fuel may fluxuate in driveway start driving and then it will say empty Low fuel light comes on as well drive for 10-20 min it will say full again. Brand new Dash Cluster so I know it ant that. Was told it could be a bad ground from the fuel tank to the car. But I dont know where the ground wire mounts to the car. Wires under the access panel are fine.

That wouldn't by chance be located by the passenger rear tire above the front of the muffler would it. I seen two electric plugs there earlier but didnt know what they were for So I left them alone. In the truck above them was what looked to be a stainless steel plate that had wires running to it couldn't see what color wire for it was wrapped in a casing and the wires came up from behind the backseat where it meets the trunk floor.

If I'm under the car there would be I believe 2 plugs parallel to each other. Do I unplug both or just one and check. Not sure which is which.

Thanks for the input everybody it's very helpful

Thanks I look in the morning to cold and dark out now to look. Will let you know what I find out.

Sorry it took me so long to get back busy schedule. Ok so I looked at those terminals under the car. The harness itself is clean as a bell. How ever there were 3 or 4 teminals that had a copperish looking color on the end. The rest looked fine. Are those 3 or 4 teminals going bad?

K Thanks Terry102 you've been very helpful.