[Oldsmobile Doctor]

Started truck to warm up ran for a while than died. When you cycle the key you can hear fuel pump running. Checked and don’t have spark at coil. Plugged in known good ignition module still no spark.
Plugged in good coil still no spark. Hooked up computer reader and cranked engine no codes or tack reading while cranking. Replaced crank position sensor and still no start. Checked the power feed to coil, ing module, crank position sensor and cam position sensor. Checked all fuses to ignition and computer. Replaced Computer and still no spark. Was working on 98 Bravada and swapped crank sensor the one from blazer worked in Bravada. Checked for spark on Blazer and it had spark swapped it back and it still had spark. Tried to start and it starts and dies. If I put gas in the throttle body it will run until it runs out.
Was running the fuel pump and it died replaced pump it still starts and dies. Purchased a fuel pressure gage and checked fuel pressure at the filter and it is 75 psi. Checked the pressure at the engine and it is 63 psi when starting than drops to 55 psi when it starts. I looked at other posts and others wouldn’t start for 10 min mine will start but die over and over.