On occasion, I have heard reference made to an "auxiliary air valve". As far apart as I have had my engine, I can't believe I haven't seen this thing, nor can I find it in any parts lists. I have finally seen one on Ebay for sale, (looks new too). This thing doesn't look familiar to me. It looks like it has an electrical plug on the end as well but I'm not sure. I must be stupid or something. Can someone please tell me WHERE on the engine this thing goes, what it does, what symptoms it causes if it fails, where to get one, and a part number??? Humbly yours, Rich #5335