i've got a stock 98 GT and heres the problem: i drove home last night for about an hour on the highway without any problems. this afternoon i turned the key and after about 5 seconds i heard a loud pop sound from the rear end (sounded kinda like someone threw a rock at the trunk). i got out and looked at the rear and noticed that there was white/clear exhaust coming out of only the right tailpipe. i got back in and noticed the RPMs dropping below 1000 (as usual) but then rising back up to 1250, then dropping again and rising back up and finally dropping below 1000 as i pull out and drive off. this is the first time this has ever happened so i'm kinda freaked out. can anyone please explain this to me???