Try vacuums, also try putting jumper cables on the ground terminal on the battery and the other side on the frame, then try motor? Maybe you lost a ground and the ecu is not getting proper voltage.
Check pin out on ECU to see if your getting proper voltage.
When it revs can you hold the gas and it stay running?
If not check exhaust. Maybe its plugged up tight!
Hurry up and figure it out before it gets towed off.....
Last effort - Try bolting a carb up to it and see it it will run.