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Message: <blockquote data-quote="ttocs" data-source="post: 1534015" data-attributes="member: 11896">The only reason I have heard of blocking off an IAC is for when you are setting the idle.  I never heard of someone driving with it blocked.  My tuning knowledge is limited but I thought while you were driving the IAC opens up to a set %open and then when you let off the gas it slowly closes to control the idle.  Taking that out of the equation could be part of the problem.  The high idle would point to a vac leak.  A cigar and a smoke test can tell you the truth to if it is.  I have seen where the leak was found to be around the butterfly of the TB that was not sealed right and allowed air to get in after the maf so it could be the new TB that is causing the problem.  What brand?</blockquote>