Ok I have a 2006 Sorento. It surges to 1700 rpm on idles also surges and chugs on exceleration. Dianostic check says the I have a #2 and #3 cylinder misfire and air fuel mis is to rich or lean. Replaced points and plugs(over 60.000 miles) still having same problems only worse. Help! Where is the air fuel mix regulator?