Vehicle 2009 buick enclave. keeps turning on the light engine and at the dealership they keep telling me that is because i don't close the gas knob correctly. when the engine light turns on while im driving it gives me a message of power engine reduce and it reduce my speed and i can't continue driving. i've almost cause 2 accidents while im driving due to this issue. it will completely stop in certain times while im driving. last incident 06/05/10. as well, my tire got flat around a month ago and i realized the dealership sold me the vehicle with no extra tire and emergency equipment to change my tire. *tr