Why is my 1999 suburban k2500 still idling rough only when real warm?

Asked by Garrett Dec 17, 2014 at 07:39 AM about the 1999 Chevrolet Suburban K2500 4WD

Question type: Maintenance & Repair

1999 k2500 suburban 130k original miles, great shape well kep had for 3 years now.  Has idled rough for 4 months, replaced mass air flow sensor, Fuel pump (cuz it went bad), Pcv valve (shop said was bad) just got it out of the shop $900, and it still drops from 700 rpm to 400 rpm only when real warm. Only after driving for over 15 minutes straight.... Any help would be greatly appreciated ''  It's better (use to drop from 700 to almost 200rpm and lights would dim) but it is NOT GOOD ENOUGH
Thanks

5 Answers
11,065

ytlas answered 9 years ago

Fuel pressure regulator? Vacuum leak? You do know a PCV valve is a $2 part and can be cleaned with carb cleaner? It hooks to a vacuum line.

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thebubba1 answered 5 years ago

It was the intake manifold gaskets leaking.... I fixed it idles perfect now

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Garrett answered 5 years ago

Man you still have it ? Could you send me some photos !!would love to see it miss that thing

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