So I'm still having some strange issues with the Toyota.

I recently switched coils and the ignition module (GM mod) on the truck. It seems to run a bit better but still does not turn off when I turn the key off.
I tried unplugging the alternator when the truck is running, but it still continues to run. I am now suspecting the coil is having feedback??
Has anyone ever had this stuff happen?

I've read that some guys put diodes in line on the alternator wire, but I don't think this is my issue. Is there anything else I can try?