380sl with severe stumble when cold

[halsk]

Have a 1984 380sl that has absolutely no power when cold - stepping on the accelerator and the car tries to stall. When the temp reaches 80C it is drivable but still lacking in power.

I have replaced the W.U.R. with 2 other units - although used - and have not solved the problem.

I have looked at the OVP relay - and the fuse checks out - but have not replaced it yet.

I have checked the fuel pressure at the WUR inlet when the engine is cold and it does measure about 40-50 PSI so think it is getting enough fuel.
The voltage at pins 2-3 of the diagnostic socket reads 13.8 volts constant - which I assume is wrong - but don't know what would cause this wrong voltage.
The only temp sensor replaced so far is the one that controls the instrument panel
Any thoughts would sure be appreciated -