Deputies said a man was going through the Beijing Wok drive-thru off of Aldine Westfield near FM 1960 Road at around 9pm when he saw two men robbing the restaurant.
The man then went across the street, got his gun and waited for the suspects to leave.
Once they left, he started firing shots at the suspects across four lanes of traffic.
Deputies do not know if the suspects were hit as they took off, possibly in a Nissan.
A customer's car was hit by one of the bullets and deputies said the customer will likely not face any charges because he has a concealed handgun license.
The suspects are still at-large.