Some times when Im just crusing down the street and mash the throttle, My truck will fly. Sometimes it just falls flat on it's face. Last weekend I pulled my air intake off and checked for Shaft play. Little to none, I tried to pull the EGR valve but I wouldn't come out...I don't have gauges to see what my turbo is pushing. So would it be stuck veins, Injector issue (engine runs smooth), EGR what!!!
*When my truck sits at an idle I can hear the turbo for a second then the whistling sound goes away, They it comes back.