So my truck when I get it at higher speeds in 4th and 5th gear it like stalls and bogs at high speeds and I feel like it's not getting enough fuel or somthing I don't know if it's the fuel pump or what I just need somewhere to start from any information would be appreciated!!

 

It might be good to know just how many miles??

Might be the engine is old and just tired.

When was the fuel filter last changed ??

Then to me anything over 50 mph is high speed but I can turn my crank pulley with my hand spark plugs still in.