ok so I tried unplugging the amps one at a time as seems to be running on 2

Unplugged one and made no difference, plugged that back in and un plugged the other and popped out of the exhaust and would not start, I then plugged the one the car ran with in to the other connector from the loom to rule that out and the car runs

Seems to be a fault with one of the amps, if its a problem with the heat sink to the back will this cause problems?

don't think theres anywhere I'll be able to get one today?? So will ring MSD in the morning