Last fall my boat was cavitating badly, I would have to baby the throttle to get it up on step to keep it from cavitating. If I punched it, it would sit and spin out. My dealer told me to replace the impeller, and the wear ring so I bought them and a puller. I just pulled it off, what do you guys think, can I clean it up and keep it as a spare? My boat came with a A impeller so I bought a AA thinking I might get a little better mpg when I am running a little heavy. My boats an aluminum weldcraft.