RPM Surge

[BlackedoutLTZ]

I did a search on this but didn't really see anything about it. But has anyone had this problem when coming to a stop the RPM's will drop down to around 500 then surge up to 1000.. I wasn't sure if I would need to do a software update or not.

 

[Mad Dawg]

I have not experienced this problem with my Tahoe, but my long gone '02 Expedition had the same problem as you have described. In the Expedition, the problem was a result of the "air idle control valve" going bad. Not sure if our vehicles have a similar type of device or not, but it's something to think about or look in to.

 

[screamin chicken]

My 99 Expedition did the samething....

 

[ventu71]

You may have a spark plug cable a bit loose, if so, sometimes the spark plug wont fire properly, therefore your rpm´s wont be stable. This happened to me, hope it helps.

 

[Randi]

My Tahoe does this as well. But only until the engine warms up...

 

[Ickulus]

Ok so I have an 08' Tahoe with 1300 miles, and I am experiencing a similar problem when idling. It sits at 500 RPM and will 'hitch' a little. The RPM doesn't move significantly, but I can definitely feel the engine/truck shake/move. No problem lights or other signs of trouble. What the heck?:umn: