Hey Scotty I have a 1997 v6 mustang and when I'm driving it feels like the transmission shudders and I can watch the tach when it does it and the needle jumps up and down. I can turn overdrive off while its doing it and it still does it. It doesnt do it all the time.

check spark plugs, filters, wiresets, and possible clean the fuel injectors. PRAY it's not the tranny wearing out, as that is the weak link on that model

I have put a new fuel filter on it and ran a few bottles of fuel injector cleaner in it so mabey I can change the plugs and wires and it'll solve the problem