If this is a new issue, then yes, it might be a clogged injector. It is summer now so outside temperature does affect things like this too.
If any work was done on the engine (or an annual was just completed) you might also check the baffling. Even if none was replaced, sometimes they get moved backwords or torn. Silicon baffling should bend forwards so that it doesn’t allow air to pass over it.
The other item to inspect are the cowl flaps for proper operation. If they’re not opening as much as they should then they need to be repaired.
Hope that helps.