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GMC Yukon XL 1500 Questions

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Ebrake is off but light is still on !
I have an 01 yukon xl 5.3 I recently changed spark plugs and wires but the plug closest to firewall on passenger side was pproblems removing and installing even with a u joint extension. The point I'm getting to is I wssnt able to get a torque wrench in to fit. How much of a problem will I have if its not actually fully tight to torque specs
My Yukon shifts into for wheel high on it's own when going down the road. It happens after driving a short period of time. It's very difficult to shift back to 2 wheel.
Replaced the starter and battery when turning the key the lights come on but nothing happens.
both the left side rear taillight and stop light fail to come on when required to do so
it continues to run when not cranked runs a while then turn off what will correct and will this run the battery down.
i have a 2002 yukon xl n i have no front heat but my rear heat is really good n hot. I checked my hoses that go to heater core n both r hot. Changed my air filters in cabin by heater core n changed my door blend actuator but still no heat. Air blows good through all vents n defrost n feet but blowing luke warm to cold air. So now im lost. So any help or comments or suggestions would be greatly appreciated. Thanks
Sometimes it will start but today it won't turn over at all we tried to jump start it and didn't work. You can hear clicking noise and the speedometer needles vibrate but nothing will turn on. I can't unlock the doors with the key fob. The times it does start sometimes the electrical stuff flickers the lights and radio go in and out and it steals offs and on for a bit then it's fine. Pleaser help
The front driver side bumper finder hood headlight and blinker all repaired the brake lights blinkers and parking lights work but when you push manual light button 3 times to turn all lights off the rear prking lights stay on. The fuse changed the relay changed and top it off security light blinking.
When I’m fueling the gas sometimes comes back up and the pump stops every few minutes during pumping
While driving at night, the console lights will dim, flicker, go off and come back on again a few seconds later. The Dim control/interior lights dial does not work on dimming, but can turn on/off the interior lights. What could be the root problem?
My transmission (automatic) started slipping in and out at about 35 mph. Once I hit about 45-50, it was fine. Had transmission rebuilt, and it kept doing the same after about two days. Replaced a barrel in transmission, after 24 hours, back to slipping. Completely replaced transmission with another rebuilt, drove about 360 miles (on a road trip... mostly interstate driving) and it started again. Not nearly as bad. Coming back home, in the middle of a nasty rainstorm that slowed interstate traffic to a crawl, it started slipping worse than ever. When the storm was over, and the truck seemed to dry out, it stopped for the most part. Back in town, it started slipping at around the same speeds (in and out). Now, when I come to a complete stop, it doesn't want to engage and I have to pull over and tap the gas until it engages and I can drive. Then it starts slipping in and out at the same speeds.
Seeing as how this is a completely different transmission, I feel that the issue isn't in the transmission itself, but something causing the transmission to start slipping gears. Also, It seems to be better when it is warm and dry. If it is moist outside, or cold, or hot, it starts slipping. Cooling temperatures, morning dew on the ground, and a couple of days of rain happened before it stopped engaging after a complete stop. This is why I believe that there is a moisture issue somewhere.
I really cannot afford a new transmission again, nor can I really afford to take it to a mechanic this time, so I'm hoping someone can give me some answers that won't be terribly expensive.

What seems to make the problem better or worse? Damp weather, cold, or hot (above 85)
How long have you had this problem? over a year
Chicke eng light always on
I bought the fuel filter in autozone but when got to the bottom of the SUV I don't see it any where.
around the frame, nop
around the tank, nop
around the driver side (front and back) nop
around the engine ,nop
around the passenger side, nop
I need help, the truck is working perfect, but I just don't want to wait until too late.
all lights work correctly
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