possible answer?
 

I've recently changed the coil packs (Two weeks ish ago) and plugs plug wires couple months ago. Recently check engine light popped a PO301 which is a front misfire....mazda ran a diag for me and said fron did it 90 times back did it 4. They also said the cat is clogged could this be the reason for the misfires? would love an answer if possible thanks guys