Donald, welcome. . .
to the best MB forum! The people here like Gilly, will get you fixed up quickly.
Also consider the fuel filter, fuel pump or maybe regulator. If the filter has not be changed, then it's a prime candidate as well as the famous (or infamous) OVP.
Sent an answer to your Email. Enjoy the forum.
Regards . . . . JimF
'94 S500 Cpe
Visit my Mercedes Web Page