Hey guys, just bought a 99 1.8t about a month ago and its been running great until today. On my way to work I noticed a strange rattling noise coming from the engine. Once I get up to speed it goes away for awhile. It rattles the most when I am at and idle. Wondering if you guys have any insight to what this could be. I do have a 3 month warranty on the car, so anything can be fixed. Any suggestions?