The infamous idle problem....I had one and I hope I fixed it. I took off the air filter and was prepared to clean out the ICV. With the air filter off, it was obvious that one of the vaccuum lines was disconnected. After I reconnected it, the rough idle resolved.

It took me about 6months to figure this out. I could have fixed it earlier if I just took off the filter to simply look and double check all the connections.

My point is start with the obvious and cheapest....fuses, motor mounts, visual inspection, cleaning out the ICV, etc.

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JR
1986 Gold 300E 4Dr automatic