Yep, I'd run an additve (actually, I prefer Red Line Fuel System Cleaner or Lubro Moly Ventil Sauber) and run it like hell flat out. Burns up the deposits and provides for some entertainment at the same time.

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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'86 420SEL
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'84 BMW 745i Turbo