1991 Ford Bronco

I just bought a 1991 bronco with a 351. The man I bought the truck from told me that the person before him had put a new flowmaster exhaust on it but they didn't reset computer to new exhaust. The truck runs fine and shifts fine but when it shifts and the rpm's drop the motor kinda sputters or bogs down until you give it a little more gas and power through it then it smooths back out. Is this an easy fix?