When creeping in traffic, 1st gear engaged, the car has a tendency to buck noticeably I give it very low throttle. It seems like the trip point is a bit less than 10%, and it always occurs at that exact throttle position.
The car feels as if it's going back and forth between coasting and engaged full decel, as if I were pulsing the throttle back and forth very quickly. I can usually get it to do this on command, but only after the car is completely warmed up, and again, only with the lightest possible amount of throttle in that one spot <10%. The car is a bone stock '08 spec B with 142,000 miles of highway tripping. It runs like a top otherwise.
I have a few suspicions: electronic throttle/tps sensor, throttle body, and/or a bad ground.
Anybody with similar experience?