i have a 2003 h2 with 48k miles. the front end seems loud to me. dealer says its the tires but i dont think so as they are stock and almost new. the sound gets louder as you decrease speed kind of like a voom voom voom sound??? also the engine rpms fluctuate up and down by as much as 750 rpm when cruising between 40 and 50 mph. taking my foot off the gas stops it but steady pressure makes it happen. if i accelerate and the tranny goes out of o/d it stops too. what do you think is up? normal?