Question about 1991 Volkswagen Jetta
Check the operation of the following:
1) Manifold Air Pressure sensor.
2) Mass Air Flow Sensor
3) O2 Sensor.
Posted on Nov 09, 2012
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Posted on Jan 02, 2017
Check for vacuum leaks. Also try cleaning the ISV.
If that doesnt work go to vwvortex.com and post your issue there
Posted on Jul 08, 2009
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