I agree with Jerry Ross, at the same time you could have one weak wire or a bad cap. Once you take off the motor is no longer under a load so any intermittent misfire will come out of nowhere. Cap, plugs wires. Or a bad engine ground, I would start at the cap and clean it or replace it if it is badly burned. Wires ground them out one at a time if you have a bad the spark will ground out.
Have you checked your fuel pump pressure. this is a throttle body. Have you tested your injectors. https://www.youtube.com/watch?v=JackfakH...
Check wires for burn spots from exhaust
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Sounds as if you need to be sure plugs are not fowling out and be sure fire from dist and coil is ok.
Check you air-fuel mixture at cruising speed. A carburator would need to be re jetted
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Hi James Carmichael, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
Can you tell me what you have done to it to repair this problem. Also when she is idling can yo go to the exhaust and tell me if there is a misfire that is far apart. Thanks
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