Misfire at cruise, popping/afterfire at 3000RPM

halifaxhops said

Hey you have another box you can change out? Just had a blue one fail similar condition.

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I have another blue one that I got as a spare - I'll try that one.

Ignition systems are so mysterious to me, and it seems the more I read, the more confused I get. Example, I read that the coil/ECU/ballast (if required) all need to match. If this is the case, how do I confirm that?

Brooks James said

Barely visible carbon tracking in the distributor cap ?

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I'm going to pop the cap off today anyway to inspect the reluctor and pickup, I'll report back.

Thanks everyone for the help so far. I really did try to figure it out on my own...promise!