Take the air cleaner off and check to make sure that the air meter plate is able to move freely and is not binding against the housing.

Does sound like fuel delivery issue though..... Could be mechanical or electrical in nature.

Is your fuel pump original? When's the last time the filter was done?

__________________
-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