Bringing a 91 K1500 back to life

[AKChevyman]

Well it has been a while since I was on here but I am in the middle of bringing a 91 Short bed Silverado 350 w/automatic back to life. I have ran into an issue I can't seem to narrow down and need the wealth of your knowledge to hopefully figure it out. Thanks to the trouble guide on here I already took some steps but still have an issue. The issue is with the TBI I have rebuilt it and replaced the MAP, TPS, Temp sensor and even the ECU. Number one issue is the truck is hard to start. Second once started it will only start for about 30 secs then die. Third is once it engine dies the injectors continue to fire for another 10-15 secs flooding the TB with fuel. Which make restarting it a lot easier but isn't right. Thanks for your help