97 jeep grand cherokee 5.2l 4x4
 

So im having some issues with my jeep. On the same weekend i got it running after a head gasket replacment my jeep stalled while driving and was not able to started. I assumed i ran out of fuel so the next day i put 5 gallons a fuel and still no start. I checked fuel pressure and had 25lbs so i replaced the fuel pump. And now it started but with an awful misfire. Turnsout only cylinders 1 through 4 are firing but have good spark and good timing on all eight. I removed both fuel rails with injector on and wired. All 8 injector open and close simultaneously as if they were one. My fuel pressure is know 50lbs and i have no idea of what is going on. Any ideas. Have good spark but the spark plugs come out wet. Spark plugs, wires, and cap n rotor are brand new.