Take the IC out and clean it up good around the oulet with a wire brush. Crap collects there and you'll probably find more pinholes. A thin coat of JB Weld works fine.
Before that though, dump about 2 cups of gas in there and shake it up. Probably quite a bit of oil is coating the inside as well. Make sure you let it air out for a little while before re installation.
I doubt a few small pinholes will make your boost drop that much but you never know...