help if possible
 

97 accord se 2.2 auto, i just got the car yesterday and it drove perfectly , and on my way home, the car rpm went to 3 rev without me barely hitting the gas, now when im in idle , and put the car on drive the car does not wanna go forward at all, sometimes up to 20 mph if im lucky, the reverse works fine, could it be a bad sensor, or the transmission, cuz i dont know if a tranny can fail so easily. help me if possible

Is the check engine light turning on while driving, or does the D4 light start flashing?

the D4 light stays on no flash, like normal, and the engine light is not on, but the engine code does say P0135 oxy heater sensor i believe