Engine misfire

Asked by Mar 14, 2016 at 06:24 AM about the 1990 Ford F-150 STD 4WD SB

Question type: Maintenance & Repair

At first I would die no fire replace coil.
distributor.plugs wires computer working harness
know it will misfire tach goes crazy .turn off
ignition restart runs fine.. Helppp

1 Answer

50,335

When the tack jumps around usually a bad ground wire. Check and clean all ground wires. May also have some bad spark plug wires, or a bad connection with the ignition wires. Make sure there are no breaks in the ignition wiring in the insulation for bare wire to be touching ground.

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