GMC Yukon Denali Questions

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I started the car and I heard this hissing in the back and saw smoke like if it came from the tail pipe but then, next day my ac blew hot air ? and my car after charging all night is dead

In the morning, I drove to work with no problems and the check engine light was not on. After an eight hour shift, I started the truck and noticed the check engine light was on. I had it diagnosed at Advanced Auto as a PO442 code. If I change the gas cap and the check engine light is on, where can I look in the engine to check the carbon filter or hoses?

comes on. if i disable the traction stability function it dosen't happen.

tried the switched in driver side and checked the fusses

Thinking vapor lock but not sure

Had it serviced, stil goes off. What say u?

After spending $650 on new front bearings, my truck now has either a transfer case issue or a differential bearing issue. I am a bit scared as to what this is going to cost me. Any input?

Started upon and performed good and then after few days did it again.

2000 GMC Yukon Denali 5.7L
I swapped Cylinder Heads for a pair of used Cylinder Heads due to the first pair being cross-threaded. After properly installing Heads and torquing them down, we then began to align crank up with TDC Mark and then aligned rotor on distributor to the distributor cap mark. After that, we tried to start it, but it would only just turn over but not start at all. The belt would turn the pulleys and all, but it just seems like it isn't making that starting sound. The fuel pump kicks on and its getting fuel. So we then removed spark plug and decided to put my finger on the hole while the Mechanic used a wrench to turn the crank until I was able to feel air, but no air would blow on my finger at all. So we then removed valve cover and aligned the valves at TDC until both were closed, then put everything back together and still no start. Mechanic then had checked for spark at the #1 plug by removing plug while I tried to start it, and it was getting spark, PLEASE HELP

Shop turns off light, but it comes back on a day or two later. Previously the gas tank vent was plugged and the chamber containing the air filter had leaves and water in the bottom. Said problem was solved. Not.

Could it be the master cylinder

Breaks going to theffloor

I have replaced the relay with no luck. I had planned on changing the multi function switch but I have read it is only the issue if it is clicking. Mine is not. Any other ideas. I have checked all the fuses as well.

If I hit a bump or hold the window button and tap the center console they all come back on do they have a common ground what is the common denominator in the center console for all three?

I replace the gas cap but the light still keeps going on and off

front axle wheel bearings only

the 30 amp fuse controls the driver seat and both passenger windows and seat. when i replace the fuse it blows out after 5 minutes. the fuse also controls the heated seat on the driver side

Checked alternator and battery not the problem. I will leave it sit for a few minutes and it will start right back up and maybe die again a little while later. Started again this morning and then died about 5 miles into my drive and pulled over. Waited for 10 minutes or so and it started up again. While driving on freeway the battery light will quickly flash and will start up again without pulling over. Please any advice?

Looks like I have the same issue as many others...electrical. My battery keeps getting drained by something. No one can figure out. I will get off a 13 hr shift, car starts up fine. Drive to market, shop, car starts, drive to gas station, fill tank, car dead. Random dying. Was told last year it was my dvd player. Took the fuse out and it seemed to be ok. Now it's doing it again. Last week it was in shop for 2 weeks, they replaced battery so it won't do it. Ugg. Today ABS light flashing and beeping, "service stability" flashing and car is trying to stop as I accelerate. Completely unsafe! Unplugged fuse to ABS and I can at least drive. So frustrated!! Replaced battery 6x, alternator 2x....not to mention transmission at 85,000 miles. Will NEVER buy another!