1986 GMC Jimmy Rough idle when its cold

1986 GMC JIMMY
196,000 MILES • 4 CYL • 2WD • MANUAL
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CHERYJ
  • MEMBER
  • 1 POST
Started experiencing a rough idle, then occasional chugging until engine was warm. Though is was related to moisture in gas tank, but no luck with treating it.

Now... when its cold and starting won't keep the idle, black residue out exhaust and if you try to drive will chug. Code reader is 22 for TPS.

How do you know the fix and is there something else to look for.
Dec 8, 2008 at 3:00 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Hi:
The black coming from the exhaust indicates that the engine is running rich. If the code is for the TPS, most likely that will take care of the problem.

Joe
Dec 9, 2008 at 2:22 AM
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