So this is something that I have noticed over the past month since I bought the car, I dont know if its just me getting adjusted to electronic throttle or there is something truely wrong. Seemingly when my foot is completely steady on the throttle, i will notice the tach and RPM of the engine bounce 3-400rpm, other times i will notice that the car seems to get "confused" about where my foot is on the pedal. Now when i first bought the car it had P0121 Throttle Position (TP) Sensor 1 Performance -PCM as well as 12 other codes, however this code has not come back since clearing the computer at the beginning of last month when I first bought the car.

So my question remains, is this something that is normal as the computer adjusts the throttle based on other conditions or is the throttle motor on my TB getting a little wonky. IMO i had planned a LSJ throttle body upgrade for this car but im wondering now if i should consider it a little sooner then expected with the way it behaves.

 

Is this what its doing...https://www.cobaltss.net/forums/prob...ucking-300345/

Thats my car - and no mechanic seems to know how to help me. It just getting potentially worse every time i drive it.

 

thats EXACTLY what it is doing :rofl:

 

whats strange about it is i didnt get any noticeable different in the way the car was driving when it was bouncing like that, i just so happened to glance down and i was like...what in the hell.

 

Just got my car back from the dealers, they had a specialist look at it. said they do not know what is causing it and are giving it back to me without fix. I really dont know what to do now.