Re: 2001 GMC Sierra Warm-up Issues!
Well, it's been awhile since I started this thread, but I thought I would post an update. The nasty idle during cold mornings resurfaced and we've been living with it for too long. After doing a little more research, I discovered that a common reason this happens is due to faulty intake gaskets. From start to finish, it took me darn near six hours to complete the job. No issues at first start-up and the initial test drive went fine. We'll see how she idles in the morning.