I have a two thousand ten odyssey, with three hundred thousand miles.It started knocking and running rough last week.I have changed the plugs and the coil packs.Because I had cylinder six and two misfires, my alternator was going bad, and I changed that it's still knocking and running rough, and now it threw a code for p2654 rocker, arm, something but it's knocking really loud.So i'm wondering if the rocker arm broke broke or something. It's also showing a cylinder number six misfire and a cylinder number two misfire and a multiple cylinder misfires. Those are the two coil packs.I replaced because those were the two codes that were showing the first time.Is it possible that it's skipped time? It's the original tommy belt