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Chasing a misfire 200

I understand but I don't have a scope. You said vacuum to control pressure regulator but mine doesn't have vac.lines it's a 128 only used on the 1985 B21ft.

If I disconnect O2 sensor and adjust the fuel mixture to it's best setting by ear there isn't popping and idles smooth.It also runs fine on the road without missing. Well I will try the new/used CPR on Monday and also recheck fuel readings.






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