Check engine light came on P0171 and some other code i cant remember off the top of my head, Says could be "fuel injector" and bank 1 is running lean? i think thats what it said but it does seem to have a rough idle. Sometimes itll drop down to 600 in neutral and sometimes itll idle at about 800 jump to 1000 and drop again slowly and then itll run fine. Is this due to the CAI? I read somewhere that i wouldnt need a tune for the K&N CAI but will need one for the injen. Whats your guys opinions? Car was running 100% when i bought it about a month ago. Went on vacation for about a week (car sat in parking lot whole time) and come back and its like this 
lol
Car is a 2012 LT RS Manual 6 speed. 71.5k Miles on it.
lolCar is a 2012 LT RS Manual 6 speed. 71.5k Miles on it.
