Looks like I had some luck. I got it to work, but something new showed up. In my original post I said that I could not adjust mixture and reading was showing 39%. It is actually 40% staying steady on idle. M-B service manual tells me that it is an air flow meter sensor failure. Is my troubleshooting correct and if yes, can I replace just that electrical sensor or whole assembly with flap (less distributor) will have to be new?