How can I tell if a coil pack is starting to go bad? Truck runs rough at a complete stop

Asked by robebish6 Feb 08, 2017 at 03:52 PM about the 2007 GMC Sierra 1500 SLE1 Ext. Cab SB 4WD

Question type: Maintenance & Repair

I just had new plugs, and wires put on
Possibility of bad gas?
Possible fuel filter?

2 Answers

F_O_R answered 7 years ago

If a coil goes bad you will get a CEL warning. It may take a few miles of driving before the code shows up.

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Rowefast answered 7 years ago

Then take it off an bring it to an auto parts store for testing it to see if it is bad.

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