If it's arcing you should see some evidence of it on the coil blades I would think - burnt look, pitting, etc. In any event, you can try swapping the coils with each other and see if the problem switches cylinders. You basically want to rule out the coil itself versus the connections.
Does "snag" mean loose? If so, you can try gently pinching the female connectors together with needle nose pliers to try to get a firmer connection (if it were only so easy with human females, but I digress!). If this gets rid of the problem, I would view it as a temporary fix and suggest you go to Radio Shack or some such place and get a couple of female connectors and replace them. If you rule out the connections, there are tests of the coils themselves that can be done if you have a volt meter, though I'd have to dig through old notes to be able to tell what the readings should be. Others probably know from actual knowledge.
_________________
-Jim
'93 MC21