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Hi
original spark plugs ( MOTORCRAFT AGPS22PP1 1.0mm gap
you can use ( CHAMPION RC8PCY 0.8mm gap
or ( NGK PFR6B-II 1.1mm gap
Note that the specs given are for euro ford 2.3 engine code E5FA
See if you still have the Vehicle Emission Control Information label (the VECI label) under the hood on some radiator support member, probably. The spark plug gap is listed on it.
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:-
.044 plug gap. Use NGK iridium plugs as you do not have to gap them and they last 100K miles. Most regular NGK come pre-gapped, It never hurts to check though
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