One of two problems is occuring, #1 was more then likely caused by #2. #1The positive pin on the KPT has been pushed in to far causing intermittent connection with the vamo pin. You can try to gently pull the pin on the KPT out with some needlenose pliers or tweezers. Note i said gently, if not careful you will pull the whole coil assembly out. #2 the center pin on the vamo has been pushed down by over tightening devices into the 510/ego connection.