Helpful Threads - Submit them Here!!

We are trying to get a good list of threads together that will help to answer some common questions.  If you find a thread that really helped you out, please post a link to it here. 

I do not want to have this thread turn into a discussion on the individual threads or their merit, just a place to drop a link to a thread you found helpful.

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Seafoam

Transmission Trouble Code 1870  Valve Body Replacement
http://www.blazerforum.com/m_141736/tm.htm

i have a 1986 s-10 blazer.
im having a problem with the idling on it at times
sometimes it will start to idle real high and won't idle back down unless you put it in neutral or park.  what might be my problem and how do i fix it?