I have been trying to get the check engine light to go away for awhile now and the codes im getting is p0171 and p0174! and it means "system to lean" So I replaced the fuel filter, cleaned the Mass air flow sensor with a couple sprays of electrical cleaner, ran a couple tanks of that fuel injector cleaner to clean the injectors and replaced bank 1 O2 sensor! I try and erase the codes everytime I do something but they keep coming back..... what should I do next? I heard that if you get those two together its something to do with the MAF or somthing in the fuel? any suggestions is much appreciated.. k thanks!