Has anyone ever noticed a hiccup associated with sparkplug SAG?  I have a hiccup that is occurring at random intervals from seconds to several minutes.  Sometimes it is pretty mild and sometimes it shakes the plane!  I also seem to be down in power and I am beginning to suspect plug SAG.  I have 38 hours with the Iridium plugs plus a lot of time over the years of running the engine before flight.  I had a couple instances of flooding which required that I take the plugs out and sandblast them to get them to fire.  Just drying them out didn’t work.

Thoughts??

Bill B