this only happends some times wen im driving my truck i it starts hesatating like a missfire and backfiring but then i full throttle it and itll go away then a lil after it comes back so i turn off my truck like for 5-10mins and its driving well again and wen the problem happends i get this code p0171 and p0174 which means system too lean bank 1 and 2 wat dose this mean wat can i do to fix this problem

 

Vacuum leak, air leak behind MAF, low fuel pressure, bad upper 02's just some thoughts on lean codes

 

it was a dirty maf, very dirty.

 

dirty maf probably

 

Yup i cleaned the maf and it work yesterday but today it did it like 1ns or twice but then it went away so probaly its a leak or something

 

how long ago have u changed your 02's? or if u ever have?

ive seen where the heater on them goes to slow and causes some of those problems.

anyway good luck with the fix