Not a bad suggestion, but I would also do a fuel pressure test and watch the readings during the problem period.

When my fuel pump started going, it would do similar things to what you are describing.

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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