I have replaced my EGR valve and Position Sensor and ACT sensor per code reader Diagnostic reading...getting the following codes now...337 EGR Valve Position sensor, pressure feedback sensor or EGR pressure transducer signal voltage to high. 332 Insufficent EGR flow detected. Code 131 ? , Code 361?, Code 166 "Downstream" Heated Exhaust Gas Oxygen sensor voltage signal indicates "rich" . Code 141 Fuel SYstem indicates "lean" with high flow demand. Any suggestions what next....?