My son has a 1978 Ford pick up with 400 small block, when you hook up the #4 plug wire it starts backfiring and running poorly

Asked by Feb 03, 2015 at 02:56 PM about the 1978 Ford F-100

Question type: Maintenance & Repair

He just changed wires,plugs,cap and rotor

1 Answer

44,725

It may have a burned or bent valve or the plug wire might be on the wrong connector at the distributor cap.

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