I have noticed this since I had my truck. As I am driving down the road, the truck would feel as if it were to go between having a head wind then to nothing. It was as if I was losing power and gaining it back, like the A/C kicking on and off. Ok, enough with the analogies.

I also noticed the truck was getting a little harder to start, a little more smokier on start up. I attributed it to the colder weather and the 275,xxx miles on the thing.
I went to start the truck this evening, and all it did was crank. Nothing fired, no smoke. I got under the hood and pumped the lift pump, thinking the system had lost its prime. All it did was crank. I was like

I dont need a IP. Then it hit me like..... I dont know but it just hit me. I went to the shut down solenoid and puled the spade connector on and off to get rid of the rust. Viola! It popped to life before the engine turned over once!
Before, the truck had a hard time chirping the tire going around the corner. I figured the LSD, 3.54's, and the slush box did that. Now, I have to keep it from squeeling the inside tire. I heard it chirp and the ass end shake a little like the other tire got going.
Has anybody else had this happen?
Jon