I have a 2001 4 door trd Tacoma with 3.4 motor and 4wd. It runs good and the cel (check engine light) stays off until I am decelerating from highway speeds. When it pops on it runs rough. The engine will not rev over 2000 rpm. Weirdest thing.
I have a k&n filter and I regularly clean the maf.
Can't remember the code. I think it's p0420 if I remember right.
Does anyone have any suggestions.
Will the urd o2 sim help me?