VW Golf 5 GTI. Car starts and drives, but engine runs poorly - pulsates. Sometimes revs only go up to 3,000 rpm, and holding accelerator longer at 2,500-2,800 rpm causes issues. Computer shows errors related to fuel (high or low pressure system) and air permeability. Engine is oily. Defects: Right front fender, rear arches, cracked driver seat, falling headliner.