I was going to work and hit something in the road the check engine light came on the next day took it to auto zone they read it said it was o2 sensor but they had too order it , So i went on to work with the light on when i got off work it started fine took off and it s rpm went down to 1000 and EPC light came on no trodle at all had to drive home at 20 mph so i got new sensor on and reset the computer but still the gas pedal will not work can you tell me where to look please .