Throttle air valve. I'll look for it. Wish I had the factory manual. While I'm here: it seems as though the idle is set "too high" and the surging is more a momentary drop to a reasonable idle--800-900rpm. Would the fact that I plugged off the power steering "advance" on the power steering pump be causing this? Thanks in advance. I sure appreciate you guy sharing your experiences. It's a lot of help.