Not really.there are so many things that could cause issues no point guessing...sensor issue, software tweak, mechanical issue, etc. I didn't see anything obvious in the SB's about it (and I'm not a GM employee so my access is somewhat limited too).

Let us know how it goes...

 

Does the idle vary only when it is cold?

Mine moves around quite a bit when cold but then settles in arround 700 once warmed up.

 

Its more noticeable when cold, but it still does it when warmed up. I can be sitting at a redlight in drive and just watch the rpm's go up and down. Im wanting to get a custom tune but I guess I better get these items checked out first.

 

How much does the idle change? 20-50 rpms or a lot? Mine will settle in at about 575 when it's warm and in gear. When you figure out the issue and get your tune. Charlie can set the idle at what ever you want. I had to bump it up about 75 rpms to get rid of a small stumble in my '06.

Here's what mine looks like now.



It idles very smoothly and only varies by about 20 rpms.

 

Just bought and picked up an 08 Extended cab Silverado LT1 on Saturday. The wife drove it home from the dealer. I go out to start it up a couple hours later and notice the gas gauge is empty. I asked her if the dealer filled it up before she took it, and she said she thought so. We even called the salesman, and he said yes, he put in $71.00 worth. Well crap, either he's lying, or someone syphoned our tank. Or so I thought. I went up to the gas station to fill it, and it stopped at 2.5 gallons. WTF? The tank is full, the gas gauge says empty.

So, it goes back to the dealer today. From what I am told, they are changing the fuel computer. 200 trucks on the lot, and I pick the one with a bad fuel computer. Sheez!

 

Well honestly i love my 07 its great , its real strong 13.81 on street tires headers, pulley and cai only what else do you want looks are great, everything is good on it

 

Sorry to hear that...not a great way to start a new friendship. Hopefully they get it sorted out fast, and you have no more issues!

 

Well, an update, my wife goes to pick the truck up (I'm out of town for a couple days working). They come back and say the fuel computer didn't fix it, so it's gotta be the float. Took them all day for this. They say it's internally shorted. She asks if they think it's safe to drive (shorts can equal sparks, and in a fuel tank that isn't so good). They say yeah. So she gets in, starts it up and it's running fine, but now has a check engine light. This wasn't on previously. They say they can't clear the light until they replace the fuel float. WTF, it wasn't on when it came in, why is it on now? They can't answer that question. Now to make things even a little more weird, the low level light isn't on even though the gause shows below "E". It was on when we brought it into the dealer.

I understand there will be problems with vehicles when they are new, but I sure would like better service from the dealer that sold it to us.

 

Okay...it does get better once the truck warms up. My tach isnt digital so I can nail it down to 20rpms...but it idles at 500rpms then jumps up about 100rpms or little less for just a sec or two, then falls back down to 500rpms for about 20sec, then jumps back up again. This is with no AC on, so its not the compressor kicking on. This is more noticeable in Park.

 

Not sure why it would do that

Let us know what the dealer says. I hope it's not "normal" as they like to say.