take a can of brake clean or parts cleaner and spray along and around the intake manifold where it meets the head(with the engine running). If there is a slight leak, the idle will change. It not uncommon that sometimes the intake gaskets leak without ever hearing a whistle. Also check to make...
just outta curiosity how did you check for the vacuum leak. I'm still kinda stuck on a leak... in your original post you have changed out just about every sensor or part that controls fuel, spark and timing.
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