The very first thing to check is whether or not the fuel pumps are running correctly. Should buzz for a second when you switch the key on (I think, been a long time since I had a K-jet car) and when the starter is operating. If not, replace the fuel pump relay, it's caput and you have very low fuel pressure.

Next I would replace the wires -- if the cap looked really bad, get a rotor, too. Bad rotor and wires will cause it to run very badly, lots of missing, hot cat, etc. If it was arcing all over the place, the wires are toast.

Stalling while running is usually the fuel pump relay going bad -- if it gets hot, for sure it's bad, get a new one.

From here, you need to verfiy ignition, timing (ignition and cam/crank), condition of chain (a real problem on the 380), fuel pressures, and mixture.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!