Best Service Manual?

Where would you suggest I go to obtain a good service manual that will help me with the many problems I am having with my Tahoe, such as:

replacing an armrest that has fallen off

repairing the passenger side electric door lock ( I have to lean over to manually unlock it)

repairing the driver side key entry, which cannot be unlocked using my key

troubleshooting why the engine seems to repeatedly bog down while idling.

I am open to suggestions and repair tips.

Thanks!

Factory manual, or a subscription to Alldata.com, online repair manuals.

www.helminc.com for buying factory manuals or try ebay.

//2000CAYukon