1991 pont gp 3.1l

Tiny
SCOTTSAUTO
  • MEMBER
  • 1991 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
Vehicle has very bad surge at idle when hot, runs great when cold
Friday, March 18th, 2011 AT 4:32 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
How long since a tune-up? Clean throttle-body and iac/idle air control. Any applicable mil codes? Maybe a vacuum leak after the vehicle warms up? Need something to point us in the right direction. I can look at rough idle in our database and the list is probably as long as my arm, many possible causes.
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Friday, March 18th, 2011 AT 5:01 PM

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