since it ain't cranking, have a helper hold the key to start and You under the hood see if the blue/yellow wire/terminal at the ECU and the coil positive primary terminal both have near batt voltage. for the cranking the yellow wire/terminal at the starter relay must be hot with the key held to "start" & if not check the bulkhead first then work upstream (back to ign sw) or downstream (out to starter relay) & you've grounded the "grn" terminal on the starter relay. I had a severe backfire then coasted to a stop exactly like you when my FBO black coil died. this'll get us started. EDIT it started missing for 45 minutes or so before it went out with a bang & blew up the muffler with a cloud of blue smoke. the guy in the next lane almost wrecked & likely thought he was being shot at