1997 GMC Sierra High idle and miss on #3 cyl

1997 GMC SIERRA
117,000 MILES • V8 • 4WD • AUTOMATIC
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BIGGUYMJ
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I have a presistant miss and code (engine miss) on #3 cylinder,
I have changed wires, plugs, cap and rotor, I've cleaned the EGR valve and the Idle vlave on the intake. I have run several tanks of injector cleaner through the engine. I cleaned the MAF and MAP after cleaning them the idle went way up and now sits at 1100 RPM at idle out of gear and miss show up at idle in gear. Of course check engine light is on with engine miss code on #3
Suggestions?
Fuel pump was replaced at about 50,000 miles.
Oct 28, 2008 at 3:49 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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