Change the spark plugs too while you are at it, with NGK BKR6EIX plugs (or BKR6E if you want to save money but these are the copper plugs and will not last as long as the iridium BKR6EIX).
changed out some spark plugs, shop here: http://autotech.com/passat/b6-3-6l-2006-2009/3-6l-vr6-ngk-spark-plug.html also I decided to get a new valve cover (comes with new gasket, bolts, bolt o-rings, and of course a new PCV oil separator that are prone to fail)
Mopar plugs are champion. I myself use denso or ngk in any vehicle.
I'm pretty sure that modern Mazda's do do this, only not in the situation you're describing. They use it for their stop start system to save having to fit a beefier starter motor and what not, simply inject an extra dose of fuel and fire the spark plug to get the engine going again.
I now have the new plugs which are autolite gapped at .027 as it is suggested by autolite and also in the Bentley book.
Just changed out the original plugs in my 2014 Ed30 GLi at 58K and totally agree with the other observations here. The idling has improved tremendously and the general over all performance of the car is back where it should be.
I used NGK Iridium.
I have replaced the four spark plugs with properly gapped VW (NGK) plugs and still the #2 misfires cold and randomly thereafter. The original ones looked quite normal actually - chocolaty brown. Very little wear and a .032" gap.
I did not have good experiences with Bosch on another vehicle.
I gapped them at 0.70mm, still the car was not what it was. And at high speed the km go up but there is no pulling like before.
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