... either that or something basic like ignition timing.

Can you or your mechanic do a fuel volume check? You need to unhook the fuel return line and rig it so it squirts into a container. Then pull the fuel pump relay and jumper 30 to 87, or just run 12V to the fuel pump with a jumper. You should see something like .5 liter in 30 seconds. If you don't get that volume, then look for a clogged tank strainer or fuel filter.

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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