Hello everyone! I'm new to the forum. I have a 98 GT Conv., since new in November of 97. The odometer reads just over 148K. Since new the car has always been a secondary "weekend" cruiser. So, it spends quite a bit of time parked. Lately, on cold starts after sitting a few days or more, it has an abrupt rattling noise for a second or two then goes away. It sounds like a bearing rattle but, as I mentioned, quickly goes away. I've changed the oil and opened up the filter looking for metal pieces, but nothing. The engine is completely stock. Only mods are suspension and sub-frame connectors. The car has been very well maintained. No noticeable performance issues. Anyone else ever have this issue? Any thought or ideas would be helpful.