You need to check your actual fuel pressure or lack of. If you don't have at least a mechanical fuel pressure gauge somewhere on your system, you might consider installing one. I am not sure if your system has a hand held tuner or if you can have it attached to the system while the engine is running. If it is capable of having the lap top attached while running you can gather all the information that you need about what is going on with your engine. You can also check all of the operational settings that relate to engine cooling temperature and ignition.
I am using a port injected FAST XFI 2.05 system on my car and having all the information that there is available is certainly a blessing when it comes to trouble shooting an EFI system.