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Andrew Martin
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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 ...

bubbalup
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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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