rough idle at operating temp.
I would like to request some help with my 1989 560SEL. It has had a rough idle at after it is warmed up since I bought it at 122k. I had the valves, injectors, fuel distrubutor. intake gaskets plugs changed with no improvement. The fuel distributor has been replace as well. I am frustrated with taking to shops and dealers as I have spent easily 10k chasing this issue to no avail.
I would sure appreciate any help. I have a reasonable mechanical background and am not intimidated by working on the car myself.
Also I should mention the smog pump is frozen, and removed at this time. I may replace it but I can't imagine this would be part of the problem.
Any and help appreciated.