Any CELs, and how many miles and I'm assuming it's a MTX?
Sounds to me like there is something wrong with idling, mabye a sensor gone bad, if you get a CEL take it to autozone they'll read it for free. If they pull up the code watch for what the code is and do not listen to them when they tell you what they think it is (I learned from that one). Good luck and welcome to CEG.
Also if you get a CEL and get it read, post the code up on here.
