my mate has got a clifford alarm on his coupe, alarm kept goin off so he decided to cut the alarm cable! now the car doesnt start, he has tried wireing them back together but still no luck, he doesnt want the alarm in the coupe anymore he just wants the car to run, dont no if its wired into the ecu? ive got a decoded ecu would that work? any help would be much appreciated.

when you say cut the alarm cable,have you checked the fuses.just cutting cables willy nilly is a sure fire way to blow fuses.
as well as the factory installed fuses in the car some alarms have a seperate fuse built into there harness