Carb heat lowers the amount of O2 available thereby making a richer mixture.
This is on your Written exam. Rapid power changes can freak out any engine.
The two thing together probably cause the effect, but I would wager that a
well maintained engine would not quit on you. But what do I know? I fly a
turbine machine because I hate those finicky suck-bang-blows so much. grin

Bart

wrote in message
Thanks Jan, that makes sense. So what you are saying that the
carburettor is more prone to icing when using less power?