Mustang V8-4.6L SOHC VIN X (2003)
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This may be caused by engine overheating, wrong type of fuel, loose spark plugs, too hot a plug, low fuel pump pressure or incorrect ignition
timing.
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Install a new spark plug.
9. Inspect for fused spot deposits.
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This can be identified by melted or spotty deposits resembling bubbles or blisters.
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This may be caused by sudden acceleration.
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Clean the spark plug.
INSTALLATION
1. Adjust the spark plug gap as necessary.
2. To install, reverse the removal procedure.
