Crank sensor replaced. Car fires up, runs perfectly smooth for about 2 minutes, drove around the yard and felt okay. Then it starts to break up/cough with any throttle input after a small amount of time. Grasping for ideas, I popped the distributor cap off to see if anything looked weird in there. To my surprise there was some corrosion or sign of arching on the contact areas. This is a brand new distributor cap and rotor, so not sure as to why this would arc/corrode so fast. Could the spark plug wires be the cause of this? I haven't replaced that those yet since they seemed to be okay. Could the coil also cause this type of issue? The plug wires could be original as they still have the plug numbering labels on them. What weird when it starts to die/cough/whatever its doing, if i turn it off and back on it'll run perfect again for a brief amount of time, then revert to same behavior as above. Any thoughts would be appreciated.

The coil, and the ignition controller (EZL) are possible sources of what you describe. So also is the coolant temp sensor. The W124/M103 package has been know to exhibit strange behavior as a result of a defective coolant sensor. Have you tried removing the fuel tank cap; possible venting issue?

Thanks Frank. I have swapped out a good working EZL also(well so i think), but I have not messed around with the coil or coolant temp sensor yet. I'll try the gas cap and see if that helps with anything, I'm willing to try anything Coolant temp sensor would seem most plausible as once it gets the slightest amount of heat in it, it seems to start to do this weirdness. Still don't know why if i turn if off then right back on it'll run fine for a few then decide to go back to dying.

Alright I tried the pulling off the fuel cap while it started to do its typical behavior, no luck. I pulled two sensors from a parts 126(both in thermostat housing so assuming coolant sensors), not sure if they’re the same when it comes down to what the jetronic controller is looking for, but the plugs were the same. One had a singular pin plug and the other was a two plug type sensor, o rings on each connector. Tried each plug individually and separately, and it had no effect on how things have been behaving. I am really stumped. Next up would be the coil. I’ll see about getting one, and post my update!