Finally, I had the 99 5.2L into a local mechanic and had him drive it to see what he thinks about it... Well it turns out that cylinder #5 was misfiring... He sprayed a bit of water on the spark plug wires and his words were "it was like the 4th of July in there" pretty funny since we are in Canada, but anyways. I gotta say thanks to Steve00, he always answered my questions.

It also turns out that the loss of power at 80km/h was from the torque converter, it needed a bit more power to lock it up.

Now its on to the next job... What should it be? I have a stock 99 5.2L 4x4 ext cab. I have a head unit in there with stock speakers, should I upgrade the speakers? A new intake? Seat replacment? or a mod to the rear window to make it roll down like a power window ( I always thought that would be cool)??? Give me some suggestions.

 

well if you like your misuc while you drive i would go with an alpine unit all the way around. get your high, and low speakers in there for best sound a good head unit. plus their bright blue looks great in the dark.
i have an alpin in my truck, and she sounds great.
but if you like performance go with your mods
have fun.
shannon