Weird stumble

Ignition coil???

Not to scare you, but my car did that a few times before my stator (PIP sensor) in the distributor went bad. It only happened to me when I was at a fairly constant speed like 60mph. I would feel the car hicupp a bit like it missed spark for a split second and then it would be fine.

Are any of your spark plug wires touching each other? Sometimes if they are intertwined they can arch over to one another and cause multiple firings in one cylinder and cause a stumble.