Alright. So I have figured out my problem. I couldn't maintain high speed (65+) for more than I short while. I cracked open the gas cap, and wala! Everything works fine. Now I need to find out where to clean my gas tank vents. Can anyone help me out? I'm starting by taking apart my gas cap, but I haven't really seen much clogging yet... are there more vents?

Well I do see the vents. On the top, there is one rectangular hole. On the bottom (the part facing down into the gas) there are 2 holes. One has a small silver ball, and the other is covered by something. It might be rubber... not sure. When I blow through the top hole, it comes out the hole that has the silver ball... seems to me like that would be the "out" hole, as a higher pressure in the tank would push the ball up, releasing the pressure...

I just don't know how to clean the "in" hole.