Guys, 2003 Silverado 2WD 5.3 w/ 90K.I have been getting codes for MAF, O2 etc. I have replaced plugs, wires, #3 bank, O2 back and cleaned MAF. Still runs horrible. Won't hardly idle when started and will at times die even when to temperature. RPM jumps from 500-900 when in gear. Dealer says gasket on manifold is bad and needs to replace. I can't find a vacuum leak anywhere. I have sprayed starter fluid all around the manifold and can't find anything to indicate what they are telling me. Whay else can cause this. The CEL is still on and my fuel economy is horrible.
Wednesday, January 18th, 2012 AT 5:52 PM