just a question, i have a new 08 pro4x4 off road titan, i notice when im driving when i let off the gas i can kinds feel the truck slow down like i put it in a lower gear, like the engine is breaking it, and this morning i was going down a hill with snow on it so i put it in 2cn gear and the tach would go to 1.5 to 2.5 its like it would pulsate... is this a feature i dont know about with this truck... i used to have a 05 silverado and it didnt do this...