1997 5.0 Silverado missing no CEL

[Plinkin]

I've got a 1997 silverado with a 5.0 and an automatic transmission. My problem is that when I level of it has a miss that you can definitely feel, at idle it's pretty smooth and acceleration is decent but not great. So far I've change the spider injectors, fuel pump, fuel filter, coil, icm, distributor, rotary cap and button, plugs and wires gapped myself, crank shaft ps. I was getting a vel that said random multiple missfire but it went away after I changed a few of these listed above but the problem still remains. I'm fairly certain the fuel pressure is good 55psi after that I'm at a loss as to what to check next. I've ordered a 2 book service manual so I can start checking the resistance and volts of sensors. This has been going on for a few months and hasn't changed. It used to break the tires loose in the back pretty easy, now it just revs up. The truck has 190000 or its a mpi 5.0 with a automatic transmission. Thank you.