[twstice]

im new here, and ive got the exact same problem with my '95 grand prix gtp 3.4L DOHC. i replaced the throttle position sensor thinking it might be that, it didnt change.(i read in another post that i might have positioned the sensor wrong, so that might still be the problem). i also tried replacing the idle air valve sensor, b/c sometimes when i unplugged it the engine would idle like it's supposed to for a while..., i replaced the idle air valve and it did not change with 3 different valves. i recently tried replacing the intake gaskets, but i only replaced the upper gasket. it still did not change how the engine runs. should i maybe go ahead and replace the lower intake gaskets as well??? or what should i do??? i will have looked all over the place for a vacuum leak and as far as i can tell there isnt one, i might have over looked one though. PLEAS HELP, i cannot seem to figure this out.
thanks ahead of time,
-Trevor

P.S.( i just noticed this is a rather old thread, i hope someone notices this)