98hardtopZ

iTrader: (7)

well my problem started small about a few weeks ago with a little idle surge from about 600-1000, well tonight i start it to go home and it jumps to 3 grand and sits there....i know of the vacuum line going from the brake booster to the back of the manifold. what others should i look at? what else could the problem be? anyway to check this myself without going to stealership? fast help would be greatly appreciated as my baby is sittin in a local restaurant parking lot...

RPM WS6

iTrader: (3)

Lots of things on these cars can cause idle issues like that; a full host of both electronic and hard parts failures/leaks.

Hard to tell without doing a PCM scan, and even then it can take a lot of time and random checking/luck.

Getting any codes?

98hardtopZ

iTrader: (7)

not yet...it all happened after a ported throttle body...blade is fine but could it be the iac gummed up?

RPM WS6

iTrader: (3)

Could be the IAC, or the TPS, or a vac leak from the TB gasket. Those would be most likely after a TB swap. That is, if you can rule out a sticking TB cable or a enlarged TB blade hole.

98hardtopZ

iTrader: (7)

it was small for a month now all of a sudden last night my lights were left on and my battery went dead. i went to jump it off and the rpm's jumped to 3k and sat there..

98hardtopZ

iTrader: (7)

anyway to pinpoint problem, just checked on a new iac and there 120$...looks like ill be buying a performance tb..

IRACE2

Check the pvc hose behind the TB. They usually go bad.

Blue02Ws6

iTrader: (3)

Does it drop down to regular idle after a little while or just stay @ 3K forever?
Mine is doing this after a lot of parts were swapped and new tune, but mine drops down to regular idle after like 5-7 secs or so.

98hardtopZ

iTrader: (7)

well, i took the tb off and cleaned it, put it back on and now it just surges like it used to...650-1000 rpm, in neutral, in gear it sits still but you can hear it rev a little..i replaced that hose thinking it was it also, not it...