Celica Forums General Discussion Engine and Performance 2zz cylinder 1 and random misfire

So I'm trying to figure out what in the world is causing my misfire. The injectors + ECU TSB maintenance has already been performed (who knows how long ago though), and I've replaced spark plugs, coil packs, and cleaned my MAF sensor at this point. I haven't done a compression test yet, but I'm just trying to figure out where to go from here

Only thing I could think of before a compression test would be vacuum leaks. Good luck!