I have learned the hard way that a new fuel filter on a poor-running recently-acquired car is a bad sign. What it usually means is that the car sat and crud accumulated in the fuel system. It could be that it gradually made its way to the FD and clogged it. It can also clog the screen in the warm-up regulator, in which case you will have cold-running problems.

Of course, it could also be spark, or that the plugs are so fouled that they won't fire. My favorite way to check spark is with a inductive timing light. Hook it up and see if it flashes while you crank.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe