06 GT random misfire

2006 GT 5speed. I'm having a problem that figure put at all. Short version of the symptoms. Random cylinders misfire at idle and low to mid-ish rpm's under load, and it lopes. Burnt matches/sulphur smell from exhaust. I have checked all the plugs and coils. Checked the MAF. Changed the TPS. Changed the fuel filter. Checked all 8 injectors and they are functioning. Run injector cleaner through it (do that regularly anyways). The battery and alternator are both ok, I changed both and no difference. Air filter (KNN cold air) is fine as is the throttle body and TB motor. I feel like I'm missing something else ive checked but idk long day. Have a pressure tester so I'll check for a blockage in the exhaust tomorrow. Don't know how to check the Evap system. I only have two ideas at this point what it could be and I don't even want to think about it(2 catalytic converters $$$$). Anyone else have ideas/suggestions/help? Thanks a lot guys.

Something like "misfire on random cylinders". More or less no particular cylinder seems to misfire more than any other is the gist of the code. Thanks for the reply too. Any other ideas?

I really appreciate everyone's help. I feel like a dumbass right now. At least 3 plugs went bad AT ONCE. 100k mile plugs my left nut. They looked perfect, but they weren't. 8 new plugs and she runs perfect. In short, please remember Occam's Razor. And again thanks for all the help from everyone.

That's exactly what I think was wrong with these. Since you can't adjust the gap(wonderful idea Ford) the gap obviously widens as the electrode wears. My case certainly isn't heavy duty either.