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Message: <blockquote data-quote="ttocs" data-source="post: 1487140" data-attributes="member: 11896">next time it starts doing it do a really dumb electrical test that I learned over 20 yrs ago in tech school and have used it to troubleshoot car audio up to million dollar semiconductor manf equipment.  Technical taps...  Start with your finger tips and just tap on for example the IAC.  Start light and then slowly increase how hard you tap on it, then work up to your knuckles and again increase the force.  You don't want to be hitting it hard enough to hurt yourself because often if there is an electrical problem doing this simple test will make some kind of change in how the motor is running and you can see it as you tap on it.  I have gone as far as to use the back of a screwdriver if I thought I needed more and it has been helpful at times.  It sounds stupid but technical taps is actually a term that goes all the way back to the early days of electronics with vac tubes where they would heat up and the connection at the bottom would expand and sometimes lose contact.  When they had problems they would simply go down the line of tubes and tap the top of them till it fixed the problem.  If that doesn't work then get stupid with all the wire connections.  Grab them and don't be afraid to give a good tug/pull/jiggle and get a little rough with them.  A wire harness should be able to withstand a fairly good pull on it and it should not move AT ALL.  Even small movements in the harness for something like the IAC or the MAF can cause resistance and throw off what it is doing/reading.</blockquote>