Question about 1999 Chevrolet Suburban

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1999 chevy 350 runs rough at idle. #4cyl misfire. light gray build up on spark plug. compression good 180.

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Could be plug wires/ cap/ rotor or a bad plug. I like using the ac delco platinum plugs in my chevys. building a 350 for my 84 chevy pick up now.

Posted on Sep 09, 2009

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You either have a bad spark plug wire or coil pack. The light gray color on plug is normal.

Posted on Sep 09, 2009

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