How many miles? Any work done to the exhaust system? My initial thought is cat converter or precats plugging up, but I could be way off. Just a hunch.
I could also see a flaky crank position sensor doing things like that.... Especially if tweaking the timing resistor seems to help.
Make sure you are using the correct non-resistor type plugs and not platinums...
Other than that, without more info I'm kinda lost...
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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
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