Hi, all, new guy here. I am having a problem with a 87 blazer, we just swapped out the tbi 350 for a tbi 454. This thing ran perfect with the 350, now I cant get it to start. There is fuel pressure, and spark at the plugs.I have replaced the ign module, then the whole dist. Also i have changed the computor, still nothing.Checked my grounds, and for pinched wires. Any help would be appreciated.