My car is running very rough. It has the feel of a spark plug wire that came loose from the plug. If I step on the pedal it stumbles before it runs, but upon deceleration it continues to idle poorly. I have removed my throttle housing and checked every vaccum hose and all are ok. IACV was cleaned with carb cleaner, and tested. I unplugged it and the idle was still rough, but it began to idle high. OVP was checked and swapped out with a spare one I had, made no difference. I took off the cap and cleaned that plus the rotor, distributor cap is new. I checked the spark plug wires, all are new. My spark plugs are new, but I pulled them all anyways and swapped them with a different set. Made no difference so I put the other ones back in. Only thing I can associate with the running rough is that I put some engine oil stop leak and seal in the crankcase today, but I doubt that would cause my car to run rough. Anyone know what else I should be looking at as the culprit?

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1990 190E 3.0L