I removed my strong working 1990 c900T motor from a rusted out body and placed it in a N/A 1992 rust free three door that I purchased that had its motor removed. The transfer went well and i drove the car for 6 months locally with no issues. I drove it on a 6 hour trip and the car performed great with no issues during the trip. Once i got to my destination I made a brief stop and when I came out and tried to start the car it would turn over but not start. I had it towed 5 hours back to a Saab repair shop. The car has spark/fuel but will not start. I've owned various Saab's for over 30 years and work on and repair my own cars. I've never not been able to trouble shoot and start a C900 or any SAAB. The car has a new fuel pump, a new/different ecu, the relays above the ecu have been tested.The engine has good compression.The distributor and CPS tested to be working, I had to purchase a 1992 turbo wire harness to fit the 1992 N/A body,the motor is a 1990 B202. Because of the distance that i broke down at, the SAAB shop was closer than my house to have the car repaired. The Saab shop owner has worked on seveal of my cars and has over 25 years working on Saab's. Any idea of what could be the issue.