Before fiddling with too much, you need to go over it and basically make sure everything is up to snuff. Vacuum lines, plugs, wires, cap, rotor, etc....

Don't go adjusting the timing without knowing why you are doing it. Have you hooked it up to a timing light yet to see where it's set?

It's time to start a thorough diagnosis, not just turn adjustment screws. That will likely lead to more problems, because adjustment is rarely the cause of trouble like this.

If you aren't up to the challenge, then take it to the mechanic now before you make any issues more expensive or harder to trace by masking them with adjustments.....

Start with the basics.... Fresh plugs and wires, rotor, cap, etc.... Find any old vacuum hoses and fix them. Spend a weekend under the hood looking for obvious stuff. If no luck, then see a mechanic.....

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition