Today, I noticed my car just sitting for a few days undercover, (the typical thing I do) and I decide like I normally do every couple days, is to let it run for a few. Well, I start it up, disengage choke, etc etc. I rev to my regular cruise shift point, ala 3500 RPM, and then I put it to 4000. Not long after, I was givin it some small revs, and after the needle started to fall back down, there was this noise, it sounded like it was comin from the exhaust or something, like something was stuck. Well, to be sure it wasn't in my head, I did a few smaller revs, aka 2000-2500, and every-time this noise was happening. I'm going to go back, as of RIGHT NOW, to get a better listen on this "sound." It wasn't an exhaust leak, it wasn't a tick sound, kind of a rattle, KINDOF.