OK, I've been gettin used to the little shake. I have found that it comes and it goes. However, it seems like it does it more after I put gas in the tank. I'm thinkin maybe there's dirt in the tank that's gettin stirred up or it has something to do with the pressure in the tank being released when the cap is removed??? I got a hold of some Techron injector cleaner and that is in my tank now. We'll see how that works out.