I am tring to find out why my F150 Supercrew with a 5.4 and is 4x4 as I start from a stop and I give it gas it shifts from 1st it shifts fine. but when it goes into 2nd gear it starts laboring really bad as if it has no power. If you give it little gas it seems like it has no power. So I decided to push the overdrive button off and it still does the same thing. I have never pulled a trailor in overdrive and it decides to shift automatically into overdrive when I am driving below 45 mph. Please help!!!

 

Sounds like the cats may be clogged. Loosen the exhaust at the manifolds and see if it runs better