ok sorry if this has been discussed before but i cant search and i read most of the faq's with this not being adressed. but right now my 00' 5 sp, cold air, catback, is throwing engine code p0171 which i know is bank 1 too lean but what is the most likely culprit... i dont know i have run fuel system cleaner, a few times and i surge in the upper rpms usually between 4-5k any help appreciated

 

someone? help please