This CEl (no1. cylinder position)popped up a couple days after it has been tuned. It come and go like a pimple. Only time I see it is when I get into it full throttle. My friend and I are having the same problem and we purchased our dizzy's from distributor king. Not trying to say it is there fault.If it is just daily driving it stays away. I like to see how people overcome this problem
Thanks
Rod

 

take the cap off and see if anything has came loose, sometimes little metal bit's may cause shorts inside the distributor