Hi, Having problems with my totally original low mileage impreza 1999 turbo wagon. Car is jumping quite violently when cold through gears 2, 3. When engine is up to temperature the car generally settles down but does lack power and misfires generally under acceleration. Did diagnostics check and code 53 showed up which I think is fuel pump/circuit. Would anyone be able to help me as I'm only basic in mechanics and would the fix perhaps be just a replacement fuel pump. Just to confirm HT leads, plugs & fuel filter recently replaced and MAF sensor and turbo boost solenoid cleaned. Really would appreciate anyone's help/advice