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Posted

I would check that cylinder for loose connection at the coil or corrosion and replace the spark plug. Bad CDIs do not usually have intermittant spark, they either work or dont work.

Posted

Have you done any preliminary diagnostic work, such as checking for spark on the miss-firing cylinder ? Checking whether that cylinder's plug is getting wet or if it's dry when it's miss-firing ? Most injectors vibrate when they are firing, if you put a finger on it you might detect one not going properly.

And, have you noticed any circumstances that seem to cause the problem, such as wet weather, after it gets hot, only on a cold start, after a certain amount of time regardless of load ?

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