For quite some time my 2002 has been making a weird sputtering noise, you can faintly here it when you are driving normal or idling, however you can clearly hear it when you go full throttle. The exhaust also shoots out black fluid when you start it up which has never concerned me, but it might have something to do with the problem, because the sound seems like it is coming from the exhaust. Anyways thank you if you took the time to read this and any advice would be appreciated.