1993 Saturn SL1 Intermittent Ignition Coil?

First of all thank u so much for ur donation it helps so much so we can keep answering peoples car questions and helping people. It is very possibley that a electricial compontent can fail interminatly over time. Normally when a cat goes bad it gets hot and plugs up the exhaust I have never really seen one fail like that. If u want to make sure what it is failing then u will have to wait till it fails for long enough to test things like if u think its the cat u will have do a back pressure test when it starts acting up. But usually a plugged cat causes a loss of power not a couple of cylinders missifiring because it effects all cyls. Can u hear a rattle uder the car on those older cats when they fail they break loose usually. When its cold tap on it with ur hand see if it rattles. Another thing u can do is remove the spark plug wires see if there is a white powder on the coil towers if there is that can cause ur problem as well. Let me know what u find.

That white powder will cause intermintant missing Thats for sure if u cleaned the towers good u should be ok I have cleaned lots of them the best thing to clean them with is a red scotch brite pad that's what I use. If u have anymore trouble with ur car let me know and I'll be happy to help u further. Let me know if it's fixed.