Does anyone have any more suggestions?

Fuel pump relay .
i would rig up a light to the pump connection to detect a intermittant fault
mak

Thanks, I will give it a try

I have a similar problem, how do you do that? Could it be the fuel pump?

Well i have been monitoring the situation as you know I have a 81 420SEL that just dies when driving, you restart the car and it takes right off again. I tried all of the suggestions so far and have changed the Jetronic control box, fuel pump relay, ovp relay, cap, rotor, plugs and now am at whits end.

Any more ideas out there?

Just change the ignition coil and wire to the distributor...that should fix it...

that's classic broken core for bosch ignition coils. especially if you have been doing other work with associated components......you didn't mention the coil and that's the first thing i would think of...good luck