I have recently gone through two sets of plugs over the last 200 miles. When first started up cold, it has a miss every now and then. I always try to let it warm up but sometimes it fouls and stalls during the warmup. When I give it throttle it runs a little rough and in most cases, it clears and then runs ok and even idles ok until I shut it down and let it cool downt. When I restart, I go through the same thing with the fouled plug thign until I get rolling again. The plugs are black and look oily wet and yes, they are the OEM recommended plugs, gap, and indexing, .