Need Help from the experts
 

In attempt to find out why my 1991 190E 2.6 stalls after I start it up, I have looked around the internet, called some dealerships up and perfomed some tests from the service cd.

What I have tested and checked ok
-tested the continuity of the wires to the components of the fuel system.
-tested the airflow meter and meets specs

What I have tested and doesnt meet specs
-the throtte valve

How do I test the ovp and mas?

Also if anyone has a lambda tester in CT and would kindly let me borrow it much appreciated.

Advice much need!