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GMC Sierra Denali Questions

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when driving slow and 4wheel steer switches to 2wheel the truck drives down the road crab like, this can be corrected by restarting the truck any way I can fix this. Thank you Ray. it's a 2002 gmc qudrasteer
having problems locating the fuel filter on a 2004 gmc seirra quadrasteer truck
Engine oil flowing out up around radiator steering box area. More when running. Then dumps when shut off engine . Then stops dripping out
I have no idea where it come from or how to prevent it.
There's no heater blowing in the truck. When u turn on the knob no heat but there is sound but no heat comes out
For past few days I observed that the truck dropped its rpm by 500 and idling at 500 onl;y even at 80 miles/hr the rpm suppose to be 2200 but its running with 1700 and the vehicle feel some grinding noise from the bottom, vechile feels rough not smooth.
only happens on cool mornings after its warmed up runs great says "engine power is reduced" and "service theft deterrent system"
Pressed acceleration peddle and vehicle sputtered as if it wanted to die. I then pulled over and shut vehicle off. Attempted to start and it would not crank unless I pressed the gas peddle.

What could this be
I'm looking for rear brake calipers but most online stores just list Sierra Denali. However, I have a quadrasteer and it needs different part from 2 wheel steer. I ordered calipers but thye didn't fit. Couls somebody recommend correct rear calipers for my vehicle. Really appreciate any help. Thank you.
When I adjust radio volume down, it goes up. When I change stations up it changes station down the dail.
This problems occurs about 50% of the time when I'm driving.
I usually just use the manual controls on the radio, they work fine.
Not sure which Denali I have Just says Denali on door. But I bought it used a month ago love it so far, But experienced a problem just before Christmas with auto lights, put vehicle in drive and head lights did not come on after messing with switch for few minutes then started working. Now if you go to bright and back sometimes the lights go out. But if you place back in bright come back on. What can I do to repair this I really like my Denali.
Sounds like slack in the DT somewhere. Notice it leaving a stop (not always.) S. Denali is a 1/2 ton PU. 5.7/6.2 litre.
any help would be great
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