thanks everyone, i really need to do some cleaning under the hood. everything looks to be pretty dirty, so im sure that cleaning the o2 sensor will help it run better. as far as the fluid needing to be flushed, i replaced both my front and rear differential fluid not too long ago, maybe 2 months or so. what other fluid are you talking about that needs to be flushed? and does anyone know any ideas to help a 3.9 manual sound better? i have a flowmaster 40 on there right now but it just doesnt give me the loud sound that i want...is there just no way to make a v6 sound deeper and louder instead of a rice getter?