Jerky & Choppy Acceleration

[lancerecruit]

I have a 2002 Grand Prix GT 3.8L. Just had the upper and lower intake gaskets replaced, the valve gaskets replaced, a new EGR valve, a new radiator, and a new 4th gear shaft put in my transmission as the car was not shifting from 3rd to overdrive (this works fine now). The problem I have is that when I depress the accelerator 1/4 to 1/2 the way down (seems like the same type spot each time), the car starts to jerk and the rpms go up and down during acceleration. Once I push the accelerator more to get past this oint, the car accelerates fine. This mostly happens when going up a hill and trying to maintain power going up the hill or, when accelerating slowly. When I punch it, no issues.

[Tech II]

When this happens, does the CE light flash?

It sounds more like a misfire, than anything else....

[olopezm]

If the CE light is not flashing I would suspect a problem with the new EGR valve, make sure it was installed correctly and the plug is seated all the way down.

Oscar.

[lancerecruit]

No. No lights are on and no codes are being thrown.

[lancerecruit]

I AM having my buddy replace my spark plugs and wires tomorrow. I just don't know. Catalytic Converter? Throttle Sensor?

[rkvons]

For the record, I was thinking Throttle Position Sensor.

[lancerecruit]

Yea. I just don't know what it could be.

[olopezm]

You can disconnect the TPS and take the car for a test drive. See if the problem goes away or keeps jerking.

Oscar.