I recently had my car in the Audi shop. It was misfiring and they replace the driver side valve cover and Gasket and the passenger side gasket for the valve cover. After $1,600 my car was still misfiring. They suggested that I get intake valves clean new spark plugs new coil packs and gaskets for another $1,600. Still afterwards cylinder 10 was still misfiring they suggested a new intake manifold cover because of the leaks causing the fuel mixture to be off causing the car to be in the lien position?? And to replace the fuel injector and cylinder 10 but would like to do all fuel injectors and seals for another $2,300. Is this car worth another $2,300 in the engine.