My friend has an 04 Acura TL (Engine Model J32A3). The car was loosing power and shuddering and the engine light came on. It appears that each cylinder is misfiring. Below is a screenshot of the code faults:
We decided to check the spark plugs and when we took out spark plug on cylinder 4 and tried to reinstall the plug, we noticed the spark plug did not go in all the way nor did the coil pack. The spark plug tip appeared to be crushed. Inside the cylinder head, there is a metallic ring had pushed up from inside the hole (we assume) that was preventing the spark plug from seating properly. This does not look like it belongs there and have no idea what it is. See images:
Here is a picture of cylinder 5 next to it, that appears normal:
Any ideas on what do at this point would be greatly appreciated.