86 535i has no spark. Checked everything out and I am down to computer or wiring harness to computer. Key symptom is if I pull down on compter in glove compartment the car starts but will not keep running when I let go. I need help for info on some one to diagnosis computer so I can isolate my problem. Has anyone had a electrical problem isolated to the computer wiring harnes. I also own a 89 635CSI, can I use that computer to isolate my problem?