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the engine to stall and surge at idle
If you have a leak in your vaccum system, it will idle a few hundred more rpm's than normal, the idle speed setting is all electronic and can't be altered.
Idle speed is computer controlled and is not adjustable.
How do you know it is surging? The most common cause for a jump in idle speed while the AC is running is when the cooling fan cycles on and puts a draw on the alternator.
A failing throttle position sensor is a common cause for idle speed fluctuations on a Jeep 4.7L.
maybe the clutch
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.
No, that has nothing to do with idle speed.
Most likely cause is a failed throttle position sensor.
My guess is it will causes the engine to surge and change engine speed up and down over and over because the ECU (computer) is searching for the right idle speed, but the bad sensor isn't sending the signal. It could also possibly cause the engine to just idle at a higher speed than normal.
it is not adjustable it is a drive by wire systemMotor Abbreviation Definitions Idle Speeds (Fuel Injected)Trans.Min. Check Speed RPMMax. Check Speed RPMFootnoteAT610710265MT650750265Note 265: Idle speed is not adjustable.
An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.