OK, I replaced the crank sensor, TPS, cam sensor, and the missfire is gone, BUT...something I have never noticed before, i believe the catalytic converter is clogged or gone. My exhaust sys is like this:1 cat per each pipe coming out of the manifolds, then there is a joiner catalytic converter, a resonator and then my pipes(no more mufflers). Now, the cat that is from the bank of cylinders #1,2,3,4 rattles when you bang on it with your fist. The joiner cat rattles too. I believe that would be a part of my hesitation or stumble upon my acceleration too. I can hear it in the exhaust pipes when u push it hard. I believe I have old broken parts in the cats that block the exhaust gasses from passing freely. Any ideas?