Guys, Strange fault developed with my car. It drives smoothly all the time and is super economical, but when you try and take it over 5krpm, it just bogs down. Almost feels like a fuel cut. Does it in all gears tested. No fault codes recorded, but what do you think it could be? Would faulty coils / bad HT leads / old spark plugs cause this problem? Faulty AFM? Car is a '99 1.6i sport. Any ideas?