Super Jet My SJ recently started fouling plugs...

There have been no changes to the ski, it was running perfect until my last time out. Put new plugs in it, and problem solved for about 30 mins. This happened again 2 times today, out of nowhere it started running like :):):):), but put new plugs in, and ran perfect. I thought it was tuning problems, but the plugs are a perfect tan color.

I had a somewhat similar problem some time ago in a JS, and it was bad ground cable, which I doubt its my problem, since its an almost brand new 2010 Superjet.

I installed MSD plug caps, and problem persists.

Are there any more causes for this problem?
 
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