My thoughts too. Did you adjust the mixture after applying carb heat? That might have solved the rough running
I didnt. Next time if I do the same procedure, I will try that. Thanks.
Other than that - what was the OAT at FL110? If it's extremely cold, applying carb heat might actually bring the carb temps within the icing range. Although there will probably not enough moisture in the air at those OATs to actually cause icing.
From memory, it was probably about -5. I recall it was a fairly warm summers days with maybe +20 on the ground. Thanks to you and Peter for your replies.