engine idle

1994 CHEVROLET SILVERADO
246,000 MILES • V8 • 4WD • AUTOMATIC
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RICHARD CHOBANIAN
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engine idles good on start up.after a minute or so it feels like intermitant miss not consistant but erratic.no codes.dist,cap,rotor,plugs,wires and ignition module new.compreshion test good.smell fuel on air cleaner.
Mar 25, 2011 at 7:56 PM
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RASMATAZ
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Do you have a check engine light on ?

Go to this link: https://www.2carpros.com/articles/engine-misfires-or-runs-rough
Mar 25, 2011 at 10:33 PM
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RICHARD CHOBANIAN
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No active or inactive codes. New engine installed 5 months ago. Suspect iac valve but idle only fluxuates about 50 rpm or throttle body injectors. Fuel pump 6 years old. Pump makes no noise. Compression test good and level all cylinders. Sticky valves? Feels like hard miss!
Mar 27, 2011 at 1:48 AM
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RASMATAZ
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Clean the EGR and PCV valves and test the MAP and TPS sensor-
Mar 27, 2011 at 2:27 AM
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RICHARD CHOBANIAN
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Ok. Throttle cable controlled. Not wire. PVC valve new.
Had engine sniffed. Found no high emission levels. Did not have this issue until after engine replacement. Plugged egr will pop a code. Bad map will pop a code. Smoke tested intake intake not leaking.
Mar 27, 2011 at 3:01 AM
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RASMATAZ
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Sometimes there's a problem with a sensor and will not pop a code/s try scanning the computer-
Mar 27, 2011 at 3:55 AM
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RICHARD CHOBANIAN
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Thanks for the advice.
Mar 28, 2011 at 1:03 AM