I'm going to do my second seafoam, install my TB spacer, and CAI, and I want to clean any sensors, valves, etc possible, and I tried searching but there's no How-To readily available, and searches for three letter acronyms (TLA's) don't work because the words are too small, so I can't find IAC or EGR. I know I should clean the Throttle body butterfly valve plate, but what else? What is the EGR and where is it? This would make a nice sticky if someone can show a pic or two, because I understand this can help with the rough idle. Thanks as always!!