2008 4w. Has k&n cold air intake, drove to breck colorado and back to the eat coast changed o2 sensor, fuel pump went out on the way there. Fixed that, now back and service engine light came on on the way back. P0174 and p0171. System to lean. Says it's the catalytic converter but not sold on that. Idling it goes normal then drops...normal then drops is the pattern. Does seem to have a little less power on hills, but do 70 and set cruise control it runs like a dream. Anyone run into this?