I have a 2005 Chevy Colorado that has about 85,000 miles on it. Off and on since I have had this truck I will have a problem where the engine will seem to lose power, but remain running. I will press the acclerator and the car will seem to only coast. If I turn it off and then re-start it, the engine seems to be okay. I think it seems to be more of a problem in the winter and probably seems to be on hilly terrain. Usually it happens within the first 5 minutes of driving. The dealer seemed unaware of the problem and had no suggestions since they could not repeat it. It seems to only happen about twice a year. Does anyone have any experience or suggestions on this one?