low acceleration low rpm car shake when place in gear. on 2007 Mitsubishi Galant

problem has been about three day replace mass air flow sensor code p2100 show on monitor

Asked by for the 2007 Mitsubishi Galant
LIVE data , not 'code reader' will be better for proper diagnosis. Check basics , if no scanner. Vacuum leaks , EGR valve sticking (IF equipped). ANY misfire DTCs set?