I have a 1994 Dodge Ram 1500 that fires up but if you turn it off then try to restart it it only turns over and isn't getting gas to throttle body. I checked my OBD to find codes 13 and 21, could they

SOURCE: 1996 GMC Sierra 1500 truck fuel problem

Have you check the injector relay or maybe a fuse for injectors.

SOURCE: 2001 Dodge Ram 1500 Won't Start

Have you checked the codes?
Mine was a faulty coil.... Twice. I made a heat shield for the second one.

SOURCE: 1995 Dodge Ram 1500 2WD 5.9L fuel pump or???

Code 12 doesn't correlate, but Code 1282 may provide some insight. Code 1282 is "The fuel pump relay circuit seems to be having a problem", which would explain the disconnect/reconnect trick that sporadically works. Have the relay circuit looked at.

SOURCE: engine turns over does not fire vcm displays code 17 fuel

sounds like the coil is bad

SOURCE: stalling, 'reduced power' light, and OBD code P1125 Manufacturer control air metering...

These trucks have a drive by wire system,we seen a` lot with a broken ground wire on the rear of the drverside cyl head,this is hard to see just feel and give the wire a tug .If the wire is loose or broken the reduced engine power light will come on.