Ron Rosenfeld wrote:
I have had problems, over the years, with clogged injector; clogged
fuel
line; and clogged fuel servo. In all of those instances, the EGT for
the
affected cylinder(s) went down when engine roughness was noted.
Except for
the fuel servo when the problem became evident on takeoff and I was
concentrating on landing, rather than looking at EGT's.

I had a plug go bad and that cylinder's EGT actually went up. I never
understood that.

-Robert, M20F