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If by surge you mean the batterys volts drop and the engines rpms drop all the vehicles accessories that are on at the time are wanting to draw more amps then the vehicles alternator has to give. or by surge you mean the rpms increase a little bit and if the heat or A/C is on at the same time the A/C pump or clutch might possibly be going out.

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Q: What causes my Jeep Grand Cherokee's engine to surge when idling?
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