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86 F150 4.9L Truck runs for 20 mins then starts to skip, but if you take positive post off battery smooths out?

Truck cranks and runs for 10 to 15 mins then starts to skip really bad, but when you take the positive post off battery truck smooths out.

I think that you are attempting a dangerous test! by disconnecting the battery. What you are doing here is taking the alternators load off of the engine making it sound better, You still have a misfire somewhere!

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