I couldn't find much because of the 2009 forum crash wiping most of everything out. Anyways quick question. I replaced my fuel filter and while I was at the parts store decided to pick up a PCV valve to replace it too. I looked in the catalouge book to find which pcv valve the Impalas use and it led me to a valve that was threaded, but our stock valves just slide into the manifold. I put the threaded valve in and obviously just slid it in seeing as how there is nothing to thread it into. Had I known the difference at the time I wouldn't have bought the new valve but I can't see how it would hurt anything. Its still serving the same purpose. Any harm here or should I just leave it now?