Yes its the cold periods, and at the start ups after it has been sitting for a couple minutes. Last night I went and tried it out, when I left the house it did it, and I drove about a mile to the gas station and pumped gas. When i started it up and put it in gear it wanted to almost die. The rpms i noticed drops under 500 then it shoots back up. Its a weird deal, the dealership just gives the runaround.