When the fuel pump was swapped, did they remember to re-connect the wire to the air intake temp sensor? Look on the air intake hose on the side. There should be a temp sensor with a two wire hookup. It's easy to forget to put that back on when removed.

If that looks okay, remove the air filter top and make sure that the air meter flap is closing all the way, and that it is moving freely and not binding to the air funnel. Also push down the air flap and shine a light down into there and see if there is any fuel puddling up.

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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