I'm having a problem with a 2-3 second delay when I step on the accelerator from a stand still and at various speeds above 55mph. The fuel pump has been changed along with the fuel filter, but I still get a delayed response. Does this sound like a torque convertor issue? The plugs were changed about 5k ago and the throttle body has already been cleaned recently. My 01 Screw (4.6l) has 119,000 miles on it and I don't want to give it up yet! Please advise.