car stumbles pretty bad just at one tiny spot when your trying to maintain speed.
like it either speeds up or slows down but stumbles badly w/just a tiny bit of gas.

is this the tps sensor out of adjustment or is it just a bad sensor?
car is stock gsl-se 160k miles had another one with the same problem that never got resolved.

 

My GSL-SE does the same thing. While in stop and go traffic if I let completely off the clutch it jerks like crazy. It also pulses at idle(might have something to do with it?). It seems to get worse with A/C.

I've been looking at this webpage trying to figure it out: Solving GSL-SE Idle Problems

 

check secondary injectors for proper operation, check auxillary ports if it is activating while reving your engine above 3800 rpm. I found mine that one port is not working.