Serial # OT445638. Engine is merc 250 with downdraft intake with Motorola computer. Engine was rebuilt by Chris Carson and has ran perfect for the last couple of year. Last weekend put it in water and no start. Made checks today. Fuel pump appears fine when keyed on - fuel shoots out. Main power relay and fuses ok. Not getting spark with inductive timing light. I’ve separated electrical on engine from boat. I can jumper purple wire to 12v and MPR comes on briefly and turns on fuel pump and briefly puts 12v on ignition coils. I see pulses coming from crank sensor. What am I missing? Did computer just die? Ran perfect before. Many thanks for the help as always. Rick. 540-521-5211