nI read your post on the LML on your spike in one of your CHT.
 
This has happened to me many times on both my cirrus, and Lancair IV.  99.9% is a probe going bad, or the connector needs cleaned and a dab of dielectric grease on the connections.
 
If it was a plugged injector, etc,  you would see a high EGT as well. You would also notice a change in the way the engine sounds.
 
 Just by a new probe, and you'll probably be all set.
 
Hope this helps,
 
Guy