had the dissy in my car and had lots of trouble with it at idle played with the cam and dissy settings with no luck, finally pulled it out and sent it off to be tested and got a report back that it was pulling on 40 degrees of advance at idle.had it adjusted and re curved for my application and now the problem is solved, Not very happy for what is meant to be a quality American product.I recommend if you purchase one have it tested and set to suit your application other wise you may have no end of troubles.