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GMC Yukon Denali Questions

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The unlock sounds like it's working , can't find anything to manually open gate
Okay so my brake lights aren't coming on with my led taillights. But they do come on with my lights set to auto however they do not with my lights fully on or with marker lights on... if I also changed the bulbs all to incandescent and everything works as it should. So what the heck is up with that? Lol also they have worked in the past up until now which tells me the led taillight might have faulted?
Changed the battery in the remote one it will only open the drivers door
And it say reduce engine power what does this means
no problems and high expense?
It sounds like aluminum cans in a larger can banging around. Even when the car is idling the noise persists. It is not usually there when you first start the car.
I have a lot of problems with my engine, and I'll make all the reparations myself. Please help me with a service manual. Thank you
My CEL came on. I took it to auto zone, they told me that it was my fuel filter/pump. I then took it to a shop and they said a fuel filter will not cause your CEL to come on. They hooked their scanner up to my truck, then told me it was my rotar cap for spark plugs (I think) and my o2 sensor. I've gotten the rotar cap replaced since they said I can go longer without getting the o2 sensor done. My CEL went off after replacing the rotar cap bit came back on 2 days later. Do I really need to replace the fuel filter or the o2 sensor? Oh by the way, the truck hesitates like it's going to cut off while I'm stopped at a stop sign or traffic light......any advice?? Please help lol
I have a 2006 GMC Yukon XL Denali
I have loud knocking from my engine after filling up with gas from a 7 eleven. Before I put that gas in everything was fine. After filling up the next morning when I started up my car it started knocking. Then the check engine light came on indicating a misfire in cylinder 4. The knocking gets louder as I accelerate. I have checked the spark plug and cleaned the rockers and lifter tubes. It still knocks and check engine light is still reading misfire cyl 4
I'm not sure if the denali I bought used, has all the cats it's supposed to have. I live in Cali. and am having a hard time smogging it. Thank you in advance for your help
Tried to make to get gas, cut off at light didn't make it no gas. I then
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