I've been burning a ton of cash trying to fix a rough idle problem on the 1994 SL500. I've replaced everything from enginer mounts to throttle bodies to distributor caps and ignition wires. The dealer has checked the compression, intake manifold seals, injector spray pattern and for vacuum leaks. They even swapped out the air flow sensor to see if that could be a problem. After all of this... my engine still idles somewhat rough. It gets worse when the outside air is cold and damp. It can get bad enough, that I feel like I'm riding a Harley. I'm at wits end and close to an empty wallet. Can anyone give me any advice on what steps to take next. (I love my car... so dumping it isn't an option... yet.)