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My car recently started sputtering (hesitating, bucking) on occasion when I accelerate from a full stop. Additionally, it occasionally seems to temporarily lose speed when driving at a constant high speed. Right now these are merely annoying, but I fear long term effects. Check engine light has been on since I've owned it (Mech said its Cat Converter and another mentioned the IAC). At first, my car seemed to have plenty of power and though my idle RPM is low (500-600) it doesn't stall. So i asked some people and they said don't worry until I lose power or experience a stall. So here I am. T