1994 GMC Sierra 5.7 idle is affected rough and stalls, when turn on the headlights, or the heater fan, worse if both on together ?

Asked by Nov 20, 2016 at 11:03 PM about the 1994 GMC Sierra 1500 C1500 SL Standard Cab LB

Question type: Maintenance & Repair

I have changed the rail fuel filter, ecm, wires, plugs, battery
Runs fine when lights and heat fan is off, also when turn them on the power gauge drops from 14 a lot more than normal

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