K 1500 Truck 4WD V8-4.8L VIN V (2003)
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Incorrect combustion
Reduced ignition system voltage output
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Weak ignition coils
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Worn ignition wires
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Incorrect spark plug gap
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Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
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Deposit fouling - Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark plug intensity. Most
powdery deposits will not affect spark plug intensity unless they form into a glazing over the electrode.