WHY WILL CAR NOT RUN UNLESS I SPRAY FUEL DIRECTLY INTO INTAKE- SPARK IS STRONG.

CHECKED WITH A NOID LIGHT-NO SIGNAL-NO LIGHT ,NOTHING

Most likely the ecm injector driver is defecfive. Need to check the circuits to be sure ,once you buy this preflashed computer, it's yours! You need a wiring schematic for testing! If there is a shorted circuit you may fry the new ecm also. If there is an open circuit you can repair that! Good luck with it.

IF THE CIRCUITS CK OUT GOOD-I WILL REPLACE THE PCM THAT HAS BEEN PRE-FLASHED. MY QUESTION IS, DO I NEED TO HAVE IT REPROGRAMED BY A GM DEALER AFTER INSTALLATION? AND IF THE PCM IS THE PROBLEM, AND THE REPLACEMENT IS NEEDED, WILL IT RUN TO THE DEALER SHIP TO HAVE IT REPROGRAMED,OR WILL I HAVE TO TOW IT TO THE DEALERSHIP. I AM A RETIRED MECHANIC, BUT DO NOT HAVE VERY MUCH EXPERIENCE WITH PCM OR ECU'S. THANKS AGAIN

Call parts store, some can be done pre purchase and all you have to do is install. You will need the vin and computer numbers.

Call parts store, some can be done pre purchase and all you have to do is install. You will need the vin and computer numbers.