Hey guys I have been through the site a lot in the past week looking for what could be wrong with this car.

I have a 1988 300E with 167k. Car was given to me by father in law. It ran great and had MB service the entire time he owned the car. Now on to the good stuff.

Wife had been driving it and said that the blower wasn't working anymore. No issue for me as the car is still cold when I arrive at work 3 min drive. I took the car from her filled it with 87....I know. Anyways the car started to drive really bad. It felt like it had a bad miss. So I pulled the plugs and changed them. while I was changing them I looked at the rotor and cap. Did not look good but thought is this fixes it then I will change that a little later. Again got to #5 broke the wire. Went and got new wires. Replaced all of them and it was still running bad. Then on the way home i looked down and remembered oh **** it needs premium fuel. So i went and bought some lucas oil octane booster and filled it up. No change. Drove it a few more days with the bad miss but fine idle. Then it got worse so I replaced the rotor and cap. No change. Tested the coil. Got a MSD coil to replace it with but have not changed it since I do not believe that is the problem. This weekend I seen that it was at a half tank so I filled it back up with 93 octane. Ran great after the fill up. Went to drive it in the morning and it was running ****y again. Just drove it to the store to get cigs and it is really running badly. It will not idle or drive unless I FLOOR it. You can shut the engine off then start it again and it will idle for about 15 secs fine then starts to pitter and putter. Floor it it will idle again in the same sequence. ANY IDEAS........ I am quite familiar with cars besides mercedes. I have owned many race cars but am at my self with this one. PLEASE HELP.