If the distributor has a vacuum advance unplug the vacuum hose and see if the lurching goes away. If yes it's degraded wires on the distributor pole piece.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Thanks! I like this whole truck, a new engine might be called for one day, but I would prefer to put that off for a while.

A few years ago I had a horrible stalling problem. I had to put it in neutral and rev the engine somewhat at stop lights and stop signs or it would die. Trying to reverse to get into a better parking situation was an ordeal. One foot on the gas and one on the brake. I did everything I could think of, I finally took it to my mechanic buddy who is pretty sharp, he found that the distributor itself was bad. I had already put on new cap and rotor, but the thing had incredible internal friction.

__________________
Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

That sounds like the idle air control valve. Those get gunked.

The stalling could be an EGR valve sticking partially open creating a vacuum leak.

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer