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I have a 91 Legacy Sedan and when I start it or stop after idling for a while, the rpms jump from 1500 to 200 rpms and viloently goes back and forth until you put it in drive or shut it off. It doesnt cut off when Im driving or anything but whenever its at idle its jumpin all around.

 

The exhaust needs to be replaced from the headers back, could that be causing the problem? and yes, i already tried to change the pc valve(didnt help).

 

If anyone can offer any suggestions that would be great.

 

Also if you livein or near CT and have any parts for this car, that would be great.

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