OK, here is the situation - I have two citizenships, one from US and second - from a country with visa free visit of Iran.

Couple hours ago I was researching options on Skypicker to fly to Turkey from KUL and came some really weird route thru Tehran the price tag of less than $200 one way.

Could anyone tell what are implications if I will transit thru Iran, while taking but not showing my US passport and instead showing my second passport at checkpoint?