C holmes.

I just went through this problem. first, verify if you have spark. If you do, then it is most likely fuel related. Pull your MAS sensor, and put a jumper wire betweeen pins 1 and 2. Now start the car. if the car sarts, then the MAS is probably bad, or the connections need to be cleaned. Also check the fuses on your OVP relay. Let us know what happens.
Mat523

also if the car is running, and dies when it is warm you may be dealing with a faulty temp sensor

I have put a new OVP in it, but I will jump the pins on the MAS

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1987 300 TDT
1990 300 SEL