I was troubleshooting an issue with the car and found that several of the coil packs were cracked. I read a post where some members were not sure where to look for the cracks and what it would look like if the coil was in fact bad. The cracks are typically under the rubber boots at the tip. Mine were cracked from the tip under the boot almost all the way up the entire post. If your coil is cracked the spark will exit the side instead of the end of the post and ground out like this. I hope this helps out a little.