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Got a 1964.5 with 302. I've replaced points plugs and coil. still getting misfiring. When I bought new plugs they told me they came pre gap, should I gap them anyways to see if this fixes it?
 

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Hello MikeMustang64.5,
FIRST - always check the gap on plugs. Often they get banged in transit and can become set wrong.

NEXT - - What type of mistifre? In the carb or out the exhaust.

The problem could be one of many things.
Gotta try to isolate the problem. One way to do this is to start simple.

Be sure all vacuum lines are on
Check the air cleaner
Make certain there are no crossed wires.

You could pull one spark plug wire at a time and see if you find a
cylinder that make little to no difference while idle,

Many things like timing, dwell, carb adjustment etc can casue a misfore.

Of course a main concern would be valve related BUT don't think the worse.

Start simple with a few checks.

Print Dad
 

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Did you replace the condensor when you changed the points? Condensors cause a lot of problems, I would also check your point gap or dwell. You could also have some bad plug wires, or rotor and dist cap. The plug wires can be checked with an ohmmeter, 1K ohm per inch of wire is about normal, a little over is okay, say for example a wire is 27" long, it shouldn't be much over 27K, if its 50k or more its bad, the higher resistance it is, the worse it is. Post your results. Good Luck.
 
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