Random stalling was bad ground for me... (archive)

My '86 535i would randomly stall, and wouldn't catch again. I had to turn the key off, then on again. Also, the temp gauge would flicker toward the red zone. The problem was a loose ground strap at the back of the valve cover. It was loose at the firewall connection. I tightened it and all was well. Also check the engine mount ground strap while you're at it.

Is there a recommended engine cleaner that is recommended for use when I fill up my car with gas. I have this problem where are slow speeds 5 - 10 , or even in idle, the car engine just shuts off completely. In order to start it I must stop the car and turn the key again. It started happending a couple of months ago but went away when my mechanic put engine cleaner in my gas tank.
Any suggestions on an engine cleaner or why the engine may be stopping like that? It is quite scary when driving. I thought maybe that the injectors might be clogged and some engine cleaner would help. The car is an 1988 535i/is.
Any suggestion are welcome.

Thanks,
Billy

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