Chevy Celebrity Fuel Problem

We put in all new fuel system parts; fuel pump, fuel filter, pressure regulator, fuel injector, main fuel relay. But it still stalls out after trying to turn it over. We are trying to figure out what is cousing the problem. If anyone out there knows what the heck is going on please help. the Car itself is an 88 Celebrity 2.5 liter, 4 banger. It's a 4-tech motor. Please post on this or e-mail me with some help. Any and all help would really be appretiated....