I have a 99 lexus rx300 with 249000 miles and my check engine light is on and started flashing 3 to 5 times then started running a bit rough for a short time then running normally again,not often so i got the codes read at 2 auto parts stores,both time saying maf sensor and misfire on cylinder 2,4 and 6,i took out maf sensor and used maf sensor cleaner and sprayed it down well and let air out about and hour and changer the 3 plugs on those cylinders,got codes cleared and they came back on so would changing the maf sensor fix this issue or is there something else i should check into,hoping your help might save me a bigger headache and money,thanks