P2138 and P2122 codes on Malibu

So my car has been acting up for a few months
now and the mechanic can't seem to figure it out
as it is not consistent. In fact the codes do not
come on until I usually hit a pothole or a bump.
But when they do it says service traction and
ESC and gives the codes p2138 and p2122.
Which are both throttle position sensors. So I
just replaced the gas pedal today. The codes are
still there. I've already driven half an hour. As well
as let it idle and clear the code. Am I missing
something or is it something more?