Driving yesterday, let's call it "spiritedly", I had a hard 4th gear pull and during decel(letting the engine slow me down from about 6500 RPM) my CEL light flashes on for a split second then instantly goes away. No engine noise, nothing weird. Just my stomach churning and heart aching. Any possible clue as to what it could have been? Mods are OFT and Borla Mufflers.