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94 Grand Prix SE 3.1 idles weird and the RPMs bounce between 0-1 then sometimes stalls out.

Tiny
NMLOREE
  • MEMBER
  • 1994 PONTIAC GRAND PRIX
  • 172,000 MILES
I replaced the fuel filter after running out of gas also the battery and alternator. But none have fixed the problem. I put in fuel injector cleaner along with a full tank and still no fix. The RPMs still bounce and occasionally stalls out.
Friday, March 2nd, 2012 AT 8:45 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the idle control system. Get the throttle body and IAC cleaned and retest.

When the battery is disconnected, the computer needs to relearn and with a dirty throttle body and IAC, the relearning process is affected causing erratic idling.
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Friday, March 2nd, 2012 AT 9:32 PM

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