I have a 2011 Cruze with 94,000 miles. Recently, the car has developed an idle problem on top of the same rough shifting, acceleration hesitation and disappearing coolant issues that are so commonly heard about. The car is a little more sluggish than usual when accelerating from highway speeds and at an idle, it is very rough and I need to keep a little pressure on the accelerator to keep it running somewhat smoother. It's throwing "system too lean" and "Fuel/Air mixture" codes with a rare "O2 sensor" and "multiple misfire" code. Since the idle issue started, it has also started throwing "Service Traction Control System" and "Service Stabilitrac System" notices. Could use some assistance on this one.