try running a cooler plug like the RB8T. I agree with the odonnel plug theory. I have had no luck with the odonnel plugs. I couldn't finish a qualifier with those things. I only run RB or Novarossi plugs. OS and McCoy plugs seem to be ok too but I would rather spend the extra money for the RB's any day. Run the coldest plugs you can find. They take a little longer to get to temp but once they do they are alot more resiliant to richer or leaner than perfect running conditions.