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Rough idle/Misfire on cold startup

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Hi Guys

Need some advice.
I get a rough idle sometimes after the car has sat overnight. I also have gotten a couple misfire codes to go along with this. Not sure what the issue is.
After the car warms up a bit , it runs fine.

Plugs have about 15000km on them.
From my limited experience, faulty coils usually misfire when the engine is hot.

I've done some internet searching and there seems to be a few culprits.

The most likely appears to be leaky injectors. Here is a link .
http://www.bimmerfest.com/forums/showthr...p?t=596197

2nd maybe the hpfp. Will run a log to check this.

Is it possible for a leaking valve cover gasket to drip oil to the plugs?

Is there a way to test injectors without removing?

Any help will be appreciated.


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