I have a question about my old pertronix. I have the first model pertronix on my 302. I left the ignition on for 24 plus hours and was wondering if this could be my small backfire. I was wondering if it was a "work or not work" type of electronics or can there be a intermittent problem with these? Also it has had the miss on two different engines and the only thing I havent replaced is the intake and the pertronix. Thank you.