11-24-2008, 10:39 AM
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AF Newbie
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Join Date: Jun 2006
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2000 Sonoma Engine surging
I have a 2000 GMC Sonoma 4.3 V6. 11/24/2008 Here is my problem; With the Heater/ AC switch on the off position the engine runs as normal. When the heater/AC switch is turned on to any combination of cabin vents the engine surges 300 rpm at an idle or traveling down the road. Even at a stoplight, foot on the brake, it surges 300 rpm over the idle setting. Help please.
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