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PNP? 850

http://www.volvospeed.com/Repair/egr.htm

Contains a diagram with labeled parts.

I suggest you remove the idle air valve and the throttle body and give them a good clean with petrol or carb cleaner.
Be careful not to soak the idle air valve motor or the TPS in the cleaner.

Have a good look for vacuum leaks at the rubber elbows.






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