what spark plugs

I have run Champion RN12YC's and can't complain one bit. Recently I ended up with NGK (BPR5ES) because my local parts house couldn't get the champions. It may just be me, but I swear the car idles better with the NGK.
I am not saying it's because the NGK is a better plug, but my engine combo seems to be happier with it. You may want to try a few flavors of plug to see what your combo likes.