:cuss: I have a 97 jimmy 4x4, 4.3 v6 AT, does the pcm control fuel pressure before entering the CSEFI? I have replaced fuel pump twice now and truck died on me the other day, did pressure test and got 45psi key on engine 0ff and 55psi cranking, not enough to start engine. Turn key off and pressure slowly drops back to 0. Could this be from pressure regulator, pcm, fuel pump? prime with a little fuel and truck will start and run, after about 1min, CEL comes on and idle changes, tried to get CEL scanned and came up with error! Running out of ideas and patience any ideas or theories are welcome and thanx in advance.