After seeing some of the things that Rock Auto has listed lately for the car I think they got ahold of Alldata or a GM Service manual and sourced every part no mater how obscure.
I was looking for some O rings when I changed the transmission fluid, they had all the internal parts to rebuild it listed, but no O rings for the drain and fill plugs. I liked their site much better when it just had things that someone who would work on their own car might need. I don't think there are many folks the want to DIY an automatic transmission rebuild.
Oh, to stay on topic, that's what I cleaned when I cleaned my MAP sensor. It was black and pretty fuzzy on the inside. The car seemed happier and the mpgs bump up a little afterwards. I believe that was about 10000 miles ago and I'll pull it agin this weekend with next oil change just too have a look. I deleted the car a couple of weeks ago so it should stay clean now.
That sounds like the temp sensor that's in the pipe between the intercooler and the throttle valve. I pulled that one when I had to change that pipe, but I don't remember what it looked like. If you pull the computer off the side of the battery you will see it.