Just flew to breakfast this morning and the vibration was there for about
the first 10 minutes and then went away. After we ate, it was there again
for the first 5 minutes of flight and then kind of disappeared. I also
noticed strange things on the EGT. I'm now thinking it's a sticky value on
the number 4 cylinder (that's where the EGT probe is).

Can I just remove the valve covers and pull the prop through to check?

Tim