Civil war quickly erupted, during which the canals and agricultural fields of Sistan were damaged and famine became a serious problem.
In the midst of this war 'Izz al-Din granted refuge in 1363/1364 to Timur Barlas, who had recently been expelled from Transoxiana.
One day, while the malik was on a hunting trip, a Shahr-i Sistan mob overran the citadel and killed the vizier.
Together with the malik of Farah, Iksandar ibn Inaltigin, Izz al-Din and a Kartid force invaded Sistan in the spring of 1380.
At this point Izz al-Din's desire to maintain his rule weakened; he returned to Sistan and renounced the throne in favor of his son.