Bone stock 1997 in top shape, start it this morning all kinds of rough idling and maybe a slight fan interference noise. I pull it out of the garage and go to turn it off and the key does noting. It runs bad for another 2ish minutes with the key out. After spending the next twenty minuets looking for tools or chargers etc. I find nothing wrong. It starts and runs perfect for 45 minutes under all conditions. All this on a car that has a near flawless record. Anyone heard of this?