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Checking GM ignition coils and plug wires.
If corroded, can cause misfires and check engine light.
Corroded coils or spark plug wires will cause
trouble code p0300, p0301, p0302, etc. Can
cause hesitation on acceleration as well.
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Engine Operation
2.2L  3100 / 3400 
3.5L  3800 
4200  4.3L Vortec




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How To Check Ignition Coils When Engine Light Code P0300