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The Idle Speed misadjustment, Timeing misadjustment, or bad throttle position sensor. Search one of the 4WD forums like IH8MUD.com or Pirate4x4 for idle surge. check the coolant level.
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Why does my Toyota truck with 22re engine surge while idling?
Is the AC turned on?
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probably the governor going bad
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Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.
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Possible clogged or partially clogged fuel filter, or a timing issue.
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No. It's the other way around: a hurricane causes a storm surge.
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IAC (Idel Air Control Valve)
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Perhaps a weak battery? How old is battery?
