The modulators are easy to check. Just pull the vacuum lines off, smell for gas, and test with the Mityvac just to be sure.

You can put a gauge on the system and see how fast fuel pressure drops after you shut it off to test for a leaky injector. That will also tell you if you have low control pressure, which would make it run rich.

It might be worth checking the o-ring in the fuel distributor.

Please keep us posted.

__________________
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