Help with stumble
11-18-2012, 01:34 PM
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Help with stumble I've got an 03 sierra that stumbles at idle. It runs out fine, but my gas mileage on hwy is only about 16 mpg. What's the easiest way to figure out a possible misfire? Can I just disconnect each electrical connector that goes to the coil pack while engine is running until I find the one that doesn't make it run worse? Or do I need to disconnect the plug wire?
