 Yeah, not good. 50 to 100,000 volts of ignition coil voltage will wake you up. 866-594-4150. Let's talk to Rick. You're on the end of the Hood Show. Rick, what can we do for you? Well, I have a 2015 Challenger with a 5.7 Hemi. Usually in the spring when we start it up, it rattles a little bit, and then the rattle goes away. It sounds like a lifter to me. This year I started it up, and it just hasn't went away yet. I only maybe let it run for 10 minutes. I didn't just let it idle either.