P0404 Exhaust Gas Recirculation (EGR) Open Position Performance

Just wondering what to do here. Code has apparently been registered
twice. The guy at AutoZone said that the 'pathway' from the EGR needed
to be cleaned, mentioned carbon build-up.

99 Saturn SC1, 168,000+ miles. Still get great gas mileage, but burns
some oil now. The car has been stumbling on acceleration lately, but
only when the gear is a little too high (manual trans). Mashing the
gas pedal or downshifting makes it go away. Don't know what other data
to provide you. The car runs great otherwise.

Thanks a bunch!

Kelly Beard