rsw3284

recently I had my pcm replaced. After i got it back from the dealer that re-flashed it my rpms are really jumpy at idle.. it'll jump between about 900 and 1300rpm, so from a cold start it tends to be really jerky when accelerating slowly. Also, when I drive around at say about 2k-2200 rpm, the needle won't drop back down when i press the clutch; it'll just stay at that same rpm until i'm going less than 10mph or so. It also smells like it's running pretty rich. Would this just be a re-programming error? -- or possibly a vacuum leak?

it's just odd that it happened after dealer flash.

edit: '97 Trans Am WS6 M6 - Underdrive Pulleys, 58mm TB, NGKTR55 plugs, Taylor 8mm otvc, Magnaflow cat-back, B&M short shifter

rsw3284

ttt

mrmint69

Sounds like the computer is relearning the engine and should adjust it self if there is nothing else done to it. This happens every time i disconnest the battery. Not as bad as you say but close.

rsw3284

That's what I thought too, but it was still doin it the next day .. after the computer had plenty of time to relearn.

Injuneer

There is a "reset" procedure for the IAC system:

From Shoebox:

http://shbox.com/1/4th_gen_tech2.html#iac_reset

rsw3284

I'll give that a try. thanks.