I did an m30 swap a while back and put a 3000 cfm Spal fan in and wired it to the ignition coil to give it a key operated 12v(yes stupid but.... whatever) this caused it to idle for a few seconds after I turned the key off. I than discovered the auxiliary fuse box with the 12v constant and 12v key and moved the wire. It than shut off like a proper car. after a week it shuts off funny again. any ideas?