1994 GMC Truck engine low RPM

1994 GMC TRUCK
288,000 MILES • V8 • 4WD • AUTOMATIC
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WASH THE WORK
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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
May 7, 2009 at 11:52 AM
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DR LOOT
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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.
May 17, 2009 at 8:48 PM