[stephers]

I just thought of something, these engines are completly sealed, I mean that they cannot have any air leaks. I had one once that had a small air leak at the valve cover gasket and rubber end plugs. It may be way off base but worth a quick look. Try pulling out the dipstick just a bit while the car is idling and warm and see how it runs, if the miss gets worse. This will not give you a problem with starting but can cause the engine to run rough. Easy check