Originally Posted by ranger
your truck is saying should of gotten at 4.0 and 37's.
and it still wants to be yellow
Like said above, try and find a vac leak.. its MUCH cheaper (if not free) than a MAF sensor. Check out the PCV elbow, hell the whole thing might be gone, i've seen that before.
intake plenum gasket could be leaking. Easiest way is to find someone with a smoke machine.