... ran rough when started, missing at idle and under load. After about 20 minutes, things smoothed out and it ran perfectly. It has done this before.

Also, even when it is running OK, there is a sort of rythmic miss at the tailpipe idling in Park. Goes like "ummmmmm bllub blub ummmmmmm."

Maybe I need to give the Techron more time.

__________________
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