Well it's abit puzzling to me. Got the car checked by a mechanic cause thought it was over fueling as there was a very rich smell of petrol but all he found was a small fuel leak in the engine.
Have checked and replaced the plugs
New oil filter and oil
New K&N filter.
Have checked brakes there not sticking
Have changed the petrol tank as old one had a leak clean filter when changing,
Air flow meter is working as pipe fell of one day and the engine started revving very high on idle,
Exhaust is stainless steel, but manifold is standard.
Would it maybe injectors?