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Strange Misfire? 92 940 with regina

I have a 92 940 with rex regina, the car runs famously, but the idle is rough, not terriblely rough, idles rate at 750rpms like its suppose to. Now heres my dilema< when the car is warm and idling it sounds like it has a misfire, I listened up close to the engine and it seems in be farther down the exhaust like its burning unburnt fuel somewhere along the line.. the throttle was cleaned, and i run premium gas....... the idle is rough.. no codes for the computer... Any ideas?







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