Chevrolet Repair: ssr, engine cranks, passive alarm

Question
Sorry had to start a new post the other one won't let me ask anymore questions. The car is at home. The codes were c0300 p0102 p0443 and p1682. The truck started fine this morning I test drove it. The problem is when you turn the key the engine cranks like it wants to start but won't. I checked the fuel pressure it was at 60. So it is getting fuel. I took the battery to napa and they said it was fine. I hear the fuel pump working. It was raining today so I didnt get to spray the ether in it I will do it tomorrow.

Answer
HI SEAN,OK,THE TRUCK STARTED FINE THIS MORNING [YOU TEST DROVE IT] SO AS OF LATER ON TODAY THE TRUCK WILL NOT START,CORRECT. IF THE ENGINE IS CRANKING STRONG THE BATTERY IS OK..THE FUEL PRESSURE AT 60#'S THIS IS GOOD. NO PROBLEM HERE. SO IF YOU SPRAY STARTING FLUID IN THE ENGINE IT STARTS.. SO DID YOU HAVE TO TOW THE SSR BACK FROM THE DEALER OR WHAT? I AM GOING TO GO WITH THIS PROBLEM; ENGINE HAS GOOD FUEL PRESSURE AND IS CRANKING OVER GOOD,BUT WILL NOT FIRE[START UP]SO IF THERE IS FUEL AND WILL NOT START THERE ARE ONLY A FEW THINGS THAT WOULD CAUSE THIS,NO PULSE TO THE INJECTORS,FAULTY PCM,SENDING NO SIGNAL TO THE INJECTORS TO OPEN.IF IT STARTS ON STARTING FLUID ON THURSDAY WE KNOW THE IGNITION SYSTEM IS GOOD AND YOU ARE BYPASSING THE INJECTORS THIS WOULD MAKE IT START AND RUN FOR A FEW SECONDS OR SO. THAT WOULD LEAVE US WITH NO INJECTOR PULSE.[INJECTORS ARE NOT OPENING BECAUSE THERE IS NO SIGNAL FOR THEM TO OPEN AND ALLOW FUEL IN] SO THAT COULD MEAN FAULTY PCM OR THE PASSIVE ALARM IS ACTIVATED. IS THERE A SECURITY LIGHT FLASHING ON THE DASH,BY THE RADIO ??? I AM PRETTY SUDE THIS HAS A FACTORY SECURITY SYSTEM, YES..IF THIS TRUCK HAS A FACTORY ALARM,AND THE RED LIGHT IS FLASHING, HUMOR ME,TURN THE IGNITION ON TO RUN POSITION AND LET IT SIT LIKE THIS FOR 20 MINUTES,TURN THE KEY OFF AFTER 20 MIN'S AND SEE IF IT WILL START LIKE THIS. IF SO THE ALARM SYSTEM IS ACTIVATED.IF IT STARTS LIKE THIS YOU RESET THE ALARM SYSTEM FOR A FEW MORE START UPS..THIS WILL NEED A NEW PASSIVE LOCK CYLINDER AND KEY READER IN THE LOCK CYLINDER..I HOPE WE ARE ON TO SOMETHING NOW..LET ME KNOW,, TOM.