Picked my car up from getting serviced a couple of weeks ago, and the car started running really rough all of a sudden, so I pulled over to have a look and at idle the car was rocking from side to side, so I turned the car off and had a look under the car as I could hear a noise. My cat converter was glowing red hot, so I waited for it to cool down then started it up again, now it is running better but still not at 100%. Took it to an exhaust shop and they said theres no rattles etc coming from the cat so they think its ok, and that it might have been a plug/coil, except the plugs that are in it are only around 2000km old. Happened to anyone else, anyone have any ideas what this could be?