Tuning isn’t an issue as the engine is controlled by a computer. When was the last time you had a full service including spark plugs? Would be worth plugging it into a computer to see what’s going on when the spluttering occurs.
I live in Ras Al Khaimah know of any individual who is clued up in fine tuning my Porsche Cayman S 2007 model, the engine is spluttering a bit then kicks in to gear.
Many tks in advance.