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Rough Idle 850 1994

Is it possible that the idle control motor is very dirty? That would explain the worsening when the car is put in gear and smooth running when at speed.

The only good way to check the O2 sensor is with a very sensitive multimeter.

You also might check the vacuum line for the fuel pressure solenoid, there must not be any gasoline in it. Check the ECT sensor and make sure it is within spec.
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My name is Klaus and I am a V♂lv♂holic






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