Cylinder 1 Misfire Detected
Cylinder #1 misfire.
That means you have a code related to the tranmission make a troubleshooting and reset the code
PO301- Cylinder One misfire could be a bad plug or wire if not that, then coil or ignition module
Cylinder #1 misfire.
An engine cylinder misfire has been detected in cylinder # 1
Trouble code P0755 means:Shift solenoid B malfunction
Trouble code P0403 means:Exhaust gas recirculation circuit malfunction
With a scan tool.
Look on the trunk lid support arm.
Trouble code P0446 means:Evaporative emission control system vent control circuit malfunction
Trouble code P0449 means: EVAP Vent Solenoid Control Circuit Malfunction
you gotta go to a GM for that