Have '05 GT conv, 93 oct. tune with SCT Xcal 2, CAI, Borla catbacks, Eibach sports, 18x9 fronts, 18x10 rears, 4.10 gears, Hurst short shift, planning more (SC) when I have $$$ saved up. Throttle see-saws when in start/stop traffic. Have had throttle stick and ramp up to 4000 rpm, computer detected fault and gone into limp home mode. Speed shop could not find problem. No problems for awhile, then throttle stuck @ 1500 rpm until it released, computer detected fault and went into limp home mode. Now in start/stop @ low rpms throttle see-saws between idle (800 rpm) and lower (almost shutting off) until settling back to idle. Its pretty frustrating. Any ideas? Any other same experiences with anyone else?

 

Tps switch more than likely. Also check to be certain there are no leaks around the CAI or MAF that may be sucking air.

 

Yep sounds like a faulty TPS

Richard