Never assume the plugs are gapped correctly, have had many that were mishandled and there was no gap.Never assume the plugs are gapped correctly, have had many that were mishandled and there was no gap.
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I would imagine it is still under warrenty, I would take it to the dealer and let them fix it before messing with it myself. If you touch it first they may deny any warrenty repairs.
No, you've got no idea whether that is the correct setting. Your car manual should have the correct settings. Failing that, if you google "Spark plugs gap setting 1991 ford mustang" you should get an answer something akin to:-
Loose gas cap can set the emission control light to come on. Your Mustang is till under warranty, so when you get a chance. Bring it back to the dealer to ensure that it's not a major issue.
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These engines are pretty sensitive to the spark plug gap. Try replacing the plugs and making sure the gap is correct (even if they're pre-gapped. They're typically 0.055", but there should be a sticker under the hood that states the actual gap.
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