WE TOOK ON A JOB TO HELP A YOUNG MAN, 1994 CHEV 5.0L AUTO, 2WD! BLOWN UP , HE BOUGHT A 1998 5.7L TO REPLACE IT, WE REPLACE THE INTAKE MANIFOLD AND GOT EVERYTHING TOGETHER FOR HIM! STARTS GREAT, RUNS OK , TILL IT GOES INTO CLOSED LOOP , IT WANT MORE FUEL ! THERE IS NO EGR , WE UPGRADED THE ECU 7427, OEM PROM AND REPLACED THE INJECTOR WITH SOME FOR A 5.7 , I DONT KNOW THE PPH, "SORRY", AND A ADJUSTABLE FUEL PRESSURE REGULATOR, HELPED MAYBE ALITTLE! IT WANTS MORE FUEL! LOOKING FOR SOME HELP AND ADVISE! WE HAVE DONE AFEW SWAPS ,5.7 TO 5.7 AND HAD GOOD LUCK, BUT THIS HASNT GONE WELL! THANKS!!