Is it a rough idle like it's missing, or a rough idle like the RPM's are rising and falling?

Is there any stumbling or hesitation when you increase the RPM's as you drive off?

What is the on/off ratio doing at idle and 2000 RPM?

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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