GMC C/K 3500 Series Questions Any type

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Andrew Martin

1992 Gmc K3500 Surges When Ac Is On.

1992 gmc k3500 454 7.4L My truck's engine surges when the AC is on. It happens when I take my foot off the gas as I'm preparing to slow down. Usually makes the rpms surge up to 500 more than idle ...


98 Sierra 3500 Slt. Runs Rough. Changed Plugs, Wires, Rotor, Coil. Still R...

Can you help with what next to check or change. Runs good then runs rough.

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