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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If you are able to watch the cylinders drop out at the spark plugs and your not loosing it out of the coil then I would suspect the problem has to be with the distributor pick up if your sure there are no issues with the cap and rotor. If you can I would start with swapping out the distributor and see if that solves the problem.
It would sure be odd for both distributors to be bad, what happens to the timing when this occurs?
If you unplug the SPOUT connector dose it change any symptoms?
Yes but I am asking if you unplug it , do you still get the misfire. Also , what is your base timing set at?
Base timing calls for 10 BTDC. Just for the hell of it bump you timing back 2 degrees to 10 and see if there is any change.
That seems a bit odd, its should run fine at 10.
What is the output voltage at the battery with the alternator plugged it?
That should be fine and not affect the way the engine runs at all.
Have you checked to make sure the engine is properly grounded?
Well at this point Im out of ideas, If you would like, I can open the post back up for you and perhaps someone else has something new to add.
Sure thing, doing so now.