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Stumble at idle **SOLVED**

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2011 Silverado 5.3L 116K

went thru the car wash Saturday and afterwards I could feel the engine stumble while stopped at stop lights and while parked in driveway.  I just assumed something got wet.  still have stumble today.  I plan on double checking to make sure plug wires are still properly seated.  I have had one come off before.  I also plan on cleaning MAF.   

is there anything else I can check?  there are no codes or CEL



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If the spark plugs have some miles on them I would at least check them.  If your scan tool does live data check the misfire counts to determine which cylinder(s) are the problem. It also could be a vacuum leak

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  • Bleepster changed the title to Stumble at idle **SOLVED**

Maybe a different brand of plugs or plug wires is the fix, plug wires don't just "come off" a plug any more; haven't done that in 30 years. Most plug wires are really tough to get off whether they have been installed for 5 years or 5 minutes....

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Sometimes all it takes is a little moisture in the boot and as it heats up running that turns to steam and pops the wire off the plug. New wires was a wise move

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