I have a 2003 Protege ES with check engine light codes for the Throttle Positions Sensor and MAP sensor. The car will occasionally "buck" when driving under normal conditions. I replaced both the Throttle Position Sensor and MAP Sensor. The error codes set again after driving several miles. Local Mazda dealer reset the codes and confirmed the new parts are good and installed properly. Check engine light came on again when leaving the dealership. Any thoughts??