On another board http://pub76.ezboard.com/bzx23270 some one had the same squeal, and he replaced the crankcase filter. I pulled mine off yesterday and could hardly blow though it. I got the new filter today and drove it around and no squeal so far. The vacum from the valve cover is way down, didn't have time to measure it. The car also seems to be idling better. However, I did have a hard time starting it the first time. I think the computer had adjusted for the filter being clogged up and just needed to go back to normal. After I got it started and turned it off it would crank right back up.