Lancer1956
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Hey Folks, hope someone can help me out. Have a 1991 GMC 2500 Sierra 5.7 liter V-8. Been a great work truck and has always run good. 200,000 miles and has developed a miss. Code light will come on for a minute or two but not stay on. Runs good for about five minutes and then develops a misfire. After a few more minutes will sometimes start to surge. This happens when cruising. Stops when any load is on. To date I have replaced: Plugs, wires, fuel filter, distributor cap, rotor, MAP sensor and engine temp control. Local mechanics can't figure out. Any advice will be greatly appreciated.
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