I have a 2007 3.8L buick allure. One night it started running rough. I remeber remembered that I haven’t change the plugs in a while so I decided to change them. In the morning the car was fine but I decided to change the plugs anyways. When I changed the plugs one of the wires were damaged and I temporarily fixed it and the car ran fine. Later that night the car broke down. It was shaking at idle and struggling to run. It was also struggling to start; it only ran fine at high rpm. When I got home I removed the plugs and I noticed that there was either a carbon build up or oil on the threads and possibly the tip. Also when I stepped out if the car, I got a static shock from the body, this happened after running the engine.
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