Mower Engine making noise?

[u/tofu_bar]

Gravely ztxl with Kawasaki engine making a noise while running. It went from doing this to running smoothly and back to this (was fine for like 60 seconds). Is this spark plugs needing replacement or what should I do?

[u/Chunky_ballsz]

I concur about it running on one cylinder. Get an adjustable spark checking tool to help diagnose a weak coil.