I was running yesterday and started loosing power. Came home and did a compression test, 20 psi mag, 145 pto. I started tearing down the engine thinking I had melted a piston and noticed the decompression plug on the mag side was out against the fuel rail. The head was off and the piston and cylinder looked fine. I replaced the orings on both plugs, cleaned them and loctight, then reinstalled. Started it up and it runs alot better but still have a low idle (1100-1200 rpm). Rechecked the compression 145 pto, 110 mag. This explains the low idle but what happened? Did the rings get cooked from the plug falling out? Do I need a rebuild? Any info whould be great. Has anyone else had a decompression plug rattle out?