"At idle, the EHA current slowly climbs from 2-4 to about 14ma"


There is your check engine light.

I'm guessing you didn't set the basic piston height when you changed fuel distributers. With the fuel pump bypassed (pressure on the system) and the engine not running, how much freeplay do you have when you gently press on the airflap? You should have a distinct drop of a few millimeters to the point where the piston is engaged and fuel pressure opposes the movement. This point should also coincide with the bottom of the constant diameter section of the cone.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician