Hi, had my 3rd one fail after only 3 days this time, any ideas? What happens is the car runs but misfires intermittently on acceleration. I fit a new coil and all is well. Repeat. The last Bosch coil lasted 8 months. I'm running a 35DLM8 with the side mounted switching module and a 3 ohm coil with no ballast, which is correct for this.