I am having the same issue with this "surge". My truck (2011 Silverado Crew Cab LTZ) has almost lunged into a vehicle in front of me in traffic. I have had this to the dealer where they had it for two days. They could not find any issues....(nothing in the computer...codes they said). Anyway, I feel like I have to ride the brake in fear that it will idle "surge" and basically cause me to lose control of the situation. I am calling this a safety issue, and I am looking for some direction here. It appears from dock429's posts that this was the symptom he/she was experiencing, but the post above...does not seem to address that issue. Anyone else have any input? Thank you for your review. "#PIP4828:Rough Idle and/or Lack of Power on Acceleration After Cold Start. Models: 2009-2011 Chevrolet Express, Silverado, Suburban 2009-2011 GMC Savana, Sierra With any of the following V8 Engine RPO Codes: 6.0l-L76, L77, L96, LY6"