My truck ( F-150 5.0 4x4 AOD) has a severe miss at 25mph-45mph or when it kicks into overdrive. Once it gets to 55mph, it smooths out. It runs fine at an idle.

I have a simple Ford de-coder from Oreilly's Auto parts. The codes say that the maf sensor- low voltage ( # 157) and the oxygen sensor is running lean (# 172).

I cleaned the maf sensor. So far no change in performance ( severe miss at overdrive stage-from 25mph to 45mph). It has 258K on the clock.

It smokes blue and it uses quite a bit of oil.

Thanks again for all your help and advice.