Before I popped for a FD, I would check very carefully for vacuum leaks especially from cracks at the rubber connectors. I had a similar intermittent problem and it turned out to be a small crack in the rubber fitting that connects the little pipe on the back of the intake manifold to the cabin vacuum line.

So everybody has a story.

You might also have a problem with the electro/hydraulic actuator (EHA) not delivering enrichment on acceleration. This could be the EHA itself or an input to the control module.

__________________
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