Just bought thi truck for my son as first vehical. Run great up in city. got it on the highway and start on grade and loses power hard when it reaches 3000 rpm. It is a 3.0 with a 129.000 miles auto trans. Good oil pressure and temp and no weird smells under those conditions...no check engine light. previous owner had shop change fuel pump. Im kinda thinking that it was a crappy aftermarket fuel pump and its bad again...or possible a clogged cat but again no smells....so maybe not the cat. any ideas