2000 GMC Sierra 2500 Questions

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Truck has 100,000 miles on it. Just a long trips. When Im idling the gauge moves.
Fuel pump is working fine.
The Green lamp light on the dash is on but no daytime lights. The head lights work fine when you turn them on.
It runs great until you get to the speed you need then it studders and jump's.
OK, I have a 2000 GMC SIERRA 2500 6.0L V8. I just recently purchased this truck and have noticed the brakes being a little jumpy occasionally. Sometimes very bad, sometimes very little, and sometimes perfectly smooth. I pulled the wheels off and checked all of the rotors ( front and back ), and they seem to be worn down (1/16" MAX) (more like a 32nd). Anyways, they look like they have very little wear. I tried to use calipers to check for warping while spinning them and it seems that they are fine. (im no expert though). My problem with the whole situation is if my rotors were warped or worn I would expect my truck to jump everytime i brake, instead, it only jumps (or i notice it jumping the most) at lower speeds 35mph or less, and 3-4 times out of 10 it brakes perfectly smooth which leads me to think, something else could be going on. Has anyone ever heard of this or have any knowledge on this scenario? anything at all would be helpful. thanks
after i refill with fluid i have pressure for a while then over night goes away i have to pump up the pressure on pedal
i have pressure once i refill resorvoir but it wint hold fluid over night
the leak is power steering fluid it does not leak brake fluid. abs lite comes on when the fluid is low.
I just recently replaced the engine in my truck(6.0L) and the mechanic was very sloppy, and my 4wd indicator switches don't light up and in feel as though its locked in because it is hard to turn and the front drive shaft jumps when switching gears (P-D)and I had trans filter replaced too, what causes this and how can I fix it?
I have a 2000 GMC 2500 pickup with a 6.0 I go to engage the 4x4 in 4 hi or 4 low or auto 4WD and it switches over and just blinks and dose not go into 4WD I replaced the front axle actuator and the encoder motor and the switch panel and still have no different results
no codes just comes out of overflow
Is there a abs pump, on my truck?
How do get the right ECBM replacement part number?
Can this problem affect the engine idle? Rough idle?
Truck run great, but has rough idle, and when engine is hot, is hard to start.
thank you
my truck acts like it is holding back and not changing from 4 wheel to 2 wheel i was told to check the fluid to the transfer box where do i look for this at i have a gmc 4x4 serria series 2500 and when i put my truck in 2 wheel it does ok will it hurt it if i drive it in 2 wheel instead of all wheel drive??
I haven't found a vaccum leak, cleaned IAC and it still shows codes 171/174.
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