my dak seems like its stuck with overdrive off. Its tacked really high like 4000 RPM when i barely step on the gas......it used to only do that when i took overdive off.....my check engine light came on soon after the problem happened...it seems like it has no power sometimes and other times it seems like theres more power than it normally has??? help please.. thanks

 

Sounds like the tranny might be going into limp mode. What was the code that came up?