1994 GMC Truck engine low RPM

Tiny
WASH THE WORK
  • MEMBER
  • 1994 GMC TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 288,000 MILES
HI there
there the situation, I did a tune up 6 mth ago, I replaced cap, rotor, spark plugs (AC DELCO ), wires, fuel pump, fuel filter, air filter, also replaced intake gasket ( was leaking), it ran realy good all that time, 2 weeks ago it started to acting up when come to a stop, the engine rpm drop dramatically almost to a stall, but then picks up again up to normal?And it does it also when I back up? Could it be a faulty sensor? Or my catalitic converter is pluging up?

thanks
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Thursday, May 7th, 2009 AT 11:52 AM

1 Reply

Tiny
DR LOOT
  • EXPERT
I don't think so, but I'm probably wrong, I am always wrong, that's why no one gives me any vote, any way to address your question you're describing a vacuum leak, dose the RPMs go down when you apply the brake? If it does you probably have a faulty booster, check all your vacuum lines make sure they are not cracked or kinked, tried that and let me know I have some more ideas.
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Sunday, May 17th, 2009 AT 8:48 PM

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