When the car is running, it does run a bit lumpy occationally, and only today have i started it and yes it is lumpy, it almost seems like it could cut out, if i take it for a spin, it dont do it so much, its like 20% of the time its lumpy. Yes i can hear an air leek coming from the engine, which seems to be the inlet manifold, so ive bought a new gasket... you think this will help once fitted?

I also have a slight gap in my exhaust close to the exhaust manifold, but its directly under the front seats... if you know what i mean. Yes ive got a dump vavle on, a baily one, but i bought samcos with it, so no air leek there.