1994 Chevy k1500 intermittent starting and spark

Hi so this is my first time ever asking my own question in a forum, usually all I have to do is look up the general question and it’s already answered but I can’t find anything and I’m at a loss right now and need help! So my truck has been acting very weird and starts very intermittently. Now when it starts it has no problem running what so ever and it seems like it’s perfectly normal. I can turn it off and then start it back up as many times as I want and it’ll be fine. But then if I let it sit for an hour or more, it will not start. All it will do is crank and not fire. Sometimes by the next day it fires right up and runs with no problem, but other times it’ll be like two or three days before it runs again. It seems like everything is so sporadic with it. It’s getting fuel but it’s not getting spark when it decides to not work. I replaced the distributor cap and all the spark plug wires, the battery, the ignition control module, and the ignition coil. I visually inspected ground wires to see if they were burned or pinched and didn’t see anything concerning. Still nothing, my next move was going to be to replace the ECM but I wanted some input before I do so. I really don’t think it’s the distributor itself just because I feel like if the distributor was bad, it wouldn’t start at all or if it did, the truck would run very poorly which is not the case here. Are there any Other wires I can check that have to do with spark? What other things contribute to spark in this year and model? Any help would be greatly appreciated, thanks in advance.