Still not fixed. And I think I may have flubbed my dub. I picked up a used computer, which worked fine but didn't solve the problem. So I turned the EHA adjustment another 1/4 turn CW. Which seemed to make it little better but did not make the start/stall/chug-chug behavior go away.

After I readjusted the EHA, I started to reset the duty cycle. When I hooked up my meter the KOEO reading was 70%. This is a California car, and the first time I set the duty cycle I got the correct 85% reading, so I must have installed a federal computer. I replaced it with the original but the KOEO reading is still 70% and I'm having a hard time reading the duty cycle. It doesn't seem to read accurately anymore. At the moment I have the mixture set be feel and by ear, and the mileage is down from 20 to 16.

Did I damage something by installing the federal computer in the California car?

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire