1989 Jaguar XJ6 won't start. Please help!

I have an 89 Jaguar XJ6 (85000 miles) that was running excellent when I parked it but the next morning when I went to start it, it would turn over but not fire up. It fires up off of starting fluid but not on its own (it has 3/4 tank of gas). I used a noid light to check the injectors and their fine. I have replaced the fuel pump, fuel filter, fuel pressure regulator, MAF sensor, distributor cap, coil, wires, spark plugs, and battery. The car has good compression, fuel pressure and spark but will only run on starting fluid. Any help would be greatly appreciated as this is getting very expensive. Thanks XXXCustoms