Savana 3/4 Ton Van V6-4.3L VIN X (2003)
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Reduced ignition system voltage output
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Weak 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.
3. Deposit Fouling Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery
deposits will not effect spark intensity unless they form into a glazing over the electrode.