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My '01 Denali had it's fuel pump replaced about 6 months ago (at the dealership). I noticed afterwards when I let off the gas pedal (coming up to a stop sign or something), the RPMs would drop pretty low, down to about 400. It was kind of irritating, when I would step on the gas there would be...

My rearview mirror thermometer began showing wildly inaccurate temp readings recently. And for the past 2 weeks it just shows "OC". Any ideas on fixing this myself? I'd just take it to the dealer but I'm growing quite fond of the $300 in my checking account.

Well the fuel pump is fine now -- since it's a new one, $906 later. Of course I looked here AFTER I had my problems (RPMs dropping out, code reading 'running lean', would'nt start), and got it fixed (new fuel pump at the dealership). Now the idle seems a bit low, it drops down to about...

I have a '01 Denali with a rough idle when cold, seems ok when warm. I've seen a few comments about cleaning the throttle body to remedy this. I've never done that. Can someone hit me with those oh so helpful tips that make these boards a goldmine of info? :confused2:

I just bought an '01 Denali, and if I turn the key to the 'On' position I get this Humming/Vibrating from the headliner just to the left of my head, in the area of the little speaker-which I believe is for the Onstar system. I don't always hear it when the vehicle is running but I think it's...

I just bought a 2001 Denali and the first time I drove it at night I noticed a few dash lights are out: -- Buttons #1 and #4 on radio(which are above and below each other so I assume they're lit by the same bulb) -- 'Seek' rocker button on radio -- 'recirculate' button for climate...