1980 450sl does not run when warm

My 450sl starts fine and will run for about 5 minutes until it gets
warmed up. At that point it starts to run so lean that is stalls.
I have tested the fuel pressure 73psi (both warm and cold) and it is
within specs. I did a fuel volume test both when it was cold and warm
- ok. The pump and filter were replaced about 2, 000 miles ago.

I tested the control pressure from the warm up regulator to the fuel
distributor. Cold the pressure was 22 psi, warm 50 psi. Both within
the spec.

When I warm the car up and it will not run, if I hold the mass air
flow senser down a little enriching the mixture the car will run.

I have not tested the lambda control, but not sure that if it was
failing could lean the car out so much it would not run.
.

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