Hey ive had my car for about 2 years and i has been working fine until about 3 months ago...my check engine light came on like 4 months after i bought the car and they told me i needed an o2 sensor change...i changed that and the light came back on a little while ago...i have a manual tranmission and it stalls when im accelerating...it mainly does it when im going from 2nd to 3rd gear...i really dont know what it could be...do you?