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

Asked by 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

79,715

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

74,715

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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