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  1. M

    no spark

    I got a 91 4.0 4X4 and it will run some times for an hour some times 10 minutes then it will stall and not have no spark. And its real geting to be a pain . Ihave a total of about 1000 miles on it sence i put new valves in the heads. I have changed every part of the ignition coil pack, crank...
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