Protege squeaks on acceleration

Hi, I have a 2001 Protege (manual transmission) that has started squeaking when I press on the accelerator. If I press the accelerator VERY slowly and gently (not always possible in traffic!) it usually won’t squeak. The squeaking is most prominent when I go from not having my foot on the gas at all (at a stop) rather than accelerating while moving. It almost sounds like something is rubbing…Could this be a belt (which?)? Accelerator cable? Something else? Thanks for your help!