Update/New Problem:
So after some fooling around I ended up needing to get a rebuilt FD (don't ask). Phil got me a great deal and I put that in tonight & it ran really good with just a bit of a miss which I immediately tracked down to cyl #1. On top of the new FD several fuel injectors have been replaced inc #1. On inspection of #1cyl I find that the spark plug has been working (not wet, dark brown in color) but that the ceramic is cracked. I run out and get a new plug, put it in, crank the car over and... bastard won't run.
5min ago it was fine. Swapped one plug out and now it won't run. If I keep my foot @ half throttle or more it'll run, but as soon as I let off it dies immediately.
I had the exact same symptoms on an M103 a few years back that ended up being a massive vacuum leak (that time it was the big one @ the bottom of the intake manifold under the mix unit). But I can't find any leaks on this one & didn't get near any lines changing the spark plug out.
I've worked on Benz's most of my life & on this particular car for almost 7yrs. I'm no genius, but I know my way around a Mercedes engine. And I'm completely buggered right now.
Any insight, tips, ideas, offer to buy the car would be greatly appreciated.
