I know you don't have a blower car but mine did the exact same thing.I had a powerdyne blower on my GT and when the internal belt snapped, my car instantly ran better. It would make it backfire and my gas mileage was horrible.It also smelled like raw gas coming out from underneath the car.I also got codes 33 and 91.It could have something to do with airflow? Hope this helps somewhat.Good Luck!
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