Hmm, I have had my unilite for over 15 years, no issues! Maybe I got the one out of a thousand that was done right! I have also been running their pro-master coil for that time. I am just now starting to get some popping back after about 6500 rpms. (old motor did not go opver 6200) could that be the distributor/coil not firing enough? Time to upgrade?