OK so my buddy has a 03 1500 with a 5.3l 55-60k miles
been running like crap lately after it was warmed up at idle the rpm's would dip way way down like to 200 and it would want to die...i scanned it and we got 4 codes i forget what they were but it was about the MAF being bad/multiple cylinder misfires and both banks running to lean
sooo he replaced the MAF sensor and the light went out and it ran good....
for about a week then it started acting up again and i scanned it and the 2 codes i get are P0171 and P0174 bank 1 & 2 running to lean...
my question is what could this be? 02 sensors? or something else?
any help or suggestions is appreciated
thanks Mike