727 help

I can't tell you how many times I've replaced a fuel filter when the customer stated the trans wont up shift on acceleration. Most times with plug wires causing a problem will be with a misfire and will cause a pop shaking feel, if engine only gets to 4000 rpms and won't go higher it's more like low fuel volume, restricted exhaust or air or filters to name a few. now do you feel lucky you get to learn something new lol.