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After engine gets to normal operating temperature, I get rough engine running at about 30 mph. Roughness disappears at 40 mph and beyond. Already replaced cap and rotor and spark plug wires on driver's side of engine. I will replace remaining wires tomorrow. Plugs were replaced last October.
I've isolated the ground fault to the harness that connects under the driver's kick panel (hood release knob). The harness goes to the rear through some cable molding. This harness is dead shorted on the green/yellow stripe wire. I've checked the trunk light cable and receptacle: all OK. I'd be happy to drive the car with this harness disconnected except that the volts for the fuel pump are delivered by the offending harness.