i usually dont idle my car too long but this happaned the second time yesterday. i idle the car for about an hour, ac running low, music playing and then after the p0174 light comes on which means bank 2 is running lean, and the car starts to rough at 1100-1200 rpm (normal is around 800). last time it happaned i just reset it with the obd reader and everything was fine untill yesterday were i idled the car for about an hour. car is tuned with 3" intakes, upper & lower intake manifold and performance exhaust with stock cats if any of that matters. anyone have a resolution or has this happaned to anyone else?

 

I just had this happen to me did u find out what your issue was?

 

do you have the engine cover on?
i remember i took mine off and the middle bolt in the plenum causes a vacuum leak so that can be an issue

 

Switch your mafs around and see if you get the lean code for bank 1.