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2001 GMC Yukon Denali Questions

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Electrical sound service engine light on meters jumping will not start

How long have you had this problem? 8 to 10 months
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
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?
i have tried to change key switch door button wiring harness door switches nothing has worked so far
Is this maybe something I could do on my own if im a mildly capable DIYer?
whats the average price to rebuild the differential
While driving home the other day my yukon started to buck the stalled and now wont restart?
Yukon XL has over 200,000 runs fine but told Emergency brake is needing to be replaced (rusted through). Cost to repair should be roughly what? Is it a must to replace given mileage and don't do any towing ever?
i have a 2001 gmc yukon denali. where can i find a repair manual or can someone tell me the steps to follow when changing a fuel pump. is it located in the middle of the tank?
how to replace a fuel pump on a 2001 gmc yukon danali or which website can i go to download a free repair manual
how to reset oxygen sensors
My 2001 Denali XL just suddenly started having difficulty upshifting only at low speeds, start off to about 30 MPH. Once on the freeway, it shifts just fine. Transmission fluid level is OK. It does this every time. Is it just requiring a transmission service, does it have more severe internal trans problems or possibly something else?
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