159 2.4 Manifold
Ok so my 57 plate 2.4 (210) 159 is lumpy on idle and the revs hunt every 7 seconds or so. I also sometimes notice an unusual "instant kick" of power at low revs like it's suddenly woken up. The car had a brand new egr valve fitted 12 months ago by the previous owner so I'm happy with that. Looking at the top of the manifold I can see the first (closest to egr) swirl valve is wet with oil. Also pressing laterally on the valve with a screwdriver has revealed quite a bit of play. The rod and valves themselves do all seem to turn easily enough though on revving the engine.
So, my question is this:
I'm keen to retain low down response, does anyone know any good places to source a new manifold? Seen them on Ebay for 350 but hoping I might pick one up for less than that..?
Also, where might I get hold of an egr gasget that would restrict airflow without putting engine management light on? Can I just make/buy a full blank and drill a hole in it?