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|MK2 Discussion area for the second generation VW Golf and Jetta produced from 1985 to 1992.|
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It could be your CTS (coolant temp sensor). That's usually a big idle issue with these cars. o2 sensor. You can also try adjusting the idle screw on the throttle body to see if that helps. Just remember how much you turned it in case that's not the problem and you need to put it back where it was.
Check this thread out of Vortex. VWVortex.com - High Idle
You'll need a multimeter that reads ohms.
How to Test a Coolant Temperature Sensor | DoItYourself.com
|Idle Stabilization Valve, once you've located.. do ao quick experiment.. start the car, let it idle, record the idle speed.. kill the engine.. pull the plug on the ISV.. start the car again,, has the idle speed changed?|
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