Under accelaration my truck kind of bogs down drops a gear then it sounds like we should be flying but I'm not then let off the gas a bit then valves chatter all the way into overdrive, feather the gas and it quiets a bit.
been having problems for awhile
Changed intake
Coil and wires
5 or 6 O2 sensors
New cats complete pipe
Fuel pump
Still checking for vacuum leaks

 

Found intake manifold stuck open changed that much better now still doesnt have much power especially going up hills or if you punch it it bogs down then suddenly gets enough fuel and goes, but for now easy on the throttle and pray on the hills.