99 Dakota. Intermittently would have trouble going at low rpms, no power when you press peddle, erratic, like the air/fuel was wrong. Had a 0132 error code (o2 sensor 1 right?) I changed the 02 sensor before the cat and everything was fine. A week later it hesitates occasionally when I am accelerating, feels more like transmission weirdness then air/fuel but hard to tell. The check engine light is on again, getting codes 0132 and 0720. Looks like 720 is the 'Output Speed Sensor' on the transmission. I am planning to replace the speed sensor, but do you think there is a problem with the o2 sensor again? Could it be the sensor after the cat this time?

Thanks.