At low rpms in high gear truck sputters unless i really get into it ( 89 1/2 tonF-150 302 EFI 4x4) could my cat plugged or a fuel problem??? high rpms before it shifts check engine light comes on after shift goes out???[sm=americanasmiley.gif]

I SOLVED THEPROBLEM DONT BOTHER

 

sounds like exhaust. Check engine light is usually emissions or fuel system