318 won't rev past 3000 rpm

txstang84 said

Coil/coil wire OK?
did you already slave in a different ignition box, just for S&G?

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I agree with this possibility as well. I've seen control boxes go bad and act like a rev limiter. I just don't recall if it was OEM, aftermarket boxes or both. Yours is probably an OEM chrome box, not the Mopar Performnce version.