Use of Gumont Gasline Cleaner: Throw Code?

[SubeeTed]

Hi ALL again!

Well...................I decided to add Gumont's Gasline Cleaner (NOT the Injector cleaner) in my 1997 GT Legacy 2.5 DOHC. It was hesitate going up long hills.....if I didn't slap it back into 4th gear, when I added more throttle it sort of did nothing. Sometimes at low speeds it seemed lost, jurked forward. It's had it's rear 02 Sensor replaced back in March. So I put this cleaner in 100 miles....I JUST got my "Check Engine" light on just now! I don't know what code yet! I'm just wondering if using this would make it throw a code???? Help!

 

Thanks, SubeeTEd