surging

I have a 95 GMC 2500 that will occasionally surge at idle. I never noticed the problem until I recently had broken manifolds that I had changed out. At the same time I replaced the fuel filter, air filter, put in new spark plugs, new cap, new rotor, new spark plug wires, new heater core and a...

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...