OH, I failed to mention that I have a 79 450SLC (rusted out parts car) that was running. So I pulled the FD and put it in the SL. Same thing, starts runs a few seconds and dies.
When I got the car the FD was leaking. I tore it apart and it was dry. Then it started leaking. So I'm wondering if the pressure is too high.
Plans are to pull the warm up regulator and pressure regulator from the SLC and install as a pair.
Frank, after some research, I think that blue connector on the mixture controller might be control the overrun solenoid, which energizes an air bypass around the sensor plate.
I noticed that the warm up regulator has a vacuum line going to it. That line was loose, didn't seem to change much when I tightened it.
Found this site VERY helpful,,,
https://www.slideshare.net/guestceff35/bosch-k-jetronic-fuel-injection-manual