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GMC Yukon Denali Questions

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the back door isn't automatically closing it starts, when it reaches half the way in reopens.
During rapid acceleration, engine initially stalls, then accelerates. Is it bad fuel, dirty fuel filter, or what? I can't find common agreement that the 2005 gmc has a fuel filter.
A week ago my denali stopped going into park. It just stayed in reverse. The lever would go all the way up, but the dashboard light stayed at reverse. This morning i went to start my car (by putting it in neutral since i cant get it to register in park) and now tge light on my dash just stays in reverse. I have no idea what im doing, but need to get this fixed by myself. Any advise is appreciated, the more detailed the better.
I have a 6.0 liter engine and was getting 6-12 mpg in town and 14-28mpg highway. My fuel pump was just replaced and I am now reading 18-27 mpg in town and 6-7 mpg highway. Idle is high and car self propels. I can drive several miles without ever touching the gas pedal and when I made a u-turn after driving without touching the gas for at least 3/4 mile it picked up speed. I think the mechanic may have installed the wrong had pump because he seemed very surprised when I mentioned that my car had econo boost. Any advice is greatly appreciated !
is this normal, should i get it looked @ while its warrented thank you.
when i push the gas pedal my denali starts to make a really loud noise not grinding or clunking but more like a hmmm its only heard inside, the service ride control light is on and there where larger tires on it at one time. the transmission fluid looks normal and nothing else is getting hot any suggestions please help. thanks
4wd makes a bad noise in 4wd gm says theres a recall on other vins but not mine but i have the same problem what do i need to do
Won't lock from the inside or the keyless
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