Hello all...As you know I have not been getting great gas mileage at all on my vehicle. But today I had another issue I bring my vehicle to a car wash everything is fine go stop off somewhere turn the car off for 5mins once when i get into the car i but it in reverse go back 5 feet and it stalls and check engine light stays on...Code is P0011 (Got that from Onstar) Its an Engine Control System Code "Intake Cam Shaft Position System Preformance-Bank 1)...Any ideas anyone experience this before?