You may need to have your Idle Air Control Valve replaced, this drivability concern really can be caused by many things. This is your cheapest route to begin narrowing the search. If this occurs, and does not set a check engine light I would start there first. You may need to have a mechanic take your vehicle for a test drive to help hon in on your issue.
〉 Answered on Dec 3rd, 2012 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions