Hi I have recently had second hand engine fitted z22se Astra coupe 2001 which I know was running sound. When fitted into my car it splutters I have changed coil pack spark plugs still the same now thinking fuel problems before I had the engine fitted the car had stood for about 8 month would this cause any problems a couple of times I've only put £10 petrol and drove off when the petrol gage goes up and down can anyone help with this thanks