A few months ago I posted about stalling problems I was having with my '90 740. The problems began after I had been cut off while driving and stopped so fast and hard that the car stalled. From that point on, the car would stall after it had been running for about 10 minutes, whether it was in park or drive. It would start to dog out and when you hit the gas, it would knock and ping then die. Sometimes would crank but not fire until the key returned to K II.
I went through:

-A new fuel pump (Regina) and screen
-Radio Supression Relays
-Fuel Pump Relay
-Fuel filter
-Plugs
-Wires
-Vacuum lines
-Lubricated IAC
-Cleaned all grounds and battery terminals

I was about to replace the ignition switch, block temperature sensor, IAC and fuel pressure regulator when: I happened to notice a bit of corrosion re-forming on my positive battery terminal. As I began to clean I found that although the main terminal was tight, the extra wire that attaches with a nut to the same bolt was loose (see picture, the exposed red wires are to my Ford solenoid that solved starter issues when hot 10 years ago). I thought to myself: "Could this be the problem?" and tightened the nut.

VIOLA!!!!!!!!!

She fired right up and runs as smooth as ever! I took it for a 2 hour drive in stop-and-go traffic to test it and the issue is GONE BABY GONE! I'm not sure what that wire is connected to but it must be ignition or fuel delivery. Anyone know?

I wanted to pass this along to save then next person from chasing their tail. START SIMPLE! Thanks for being here Brickboard and Brickboarders!