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Message: <blockquote data-quote="RossKean" data-source="post: 1457527" data-attributes="member: 19880"><p>In a Gen II, the idle adjustment range is dependent upon the throttle body synchronization.  Most people focus on getting them all the same without regard to the actual vacuum.  This is fine, except that if they are not open enough (or too much) you may find problems getting the idle set where you want using the adjuster.  You are OK at 1100, but you may want to double check the TBS (perhaps after you do the next valve clearance check).  If I am checking and don't have idle issues, I use a homemade four column manometer that allows me to balance all four channels and adjust until they are all the same as each other.  If thing are way off or if I have idle adjust problems, I close all four throttle body synch screws to lightly seated and open each about 1/2 to 3/4 turns before I hook up the hoses.  An actual pressure measurement might be better but this has always worked for me.  Note: Do the TBS when the engine is fully warmed up.  If things are still a bit rough, it wouldn't hurt to do the TBS.  Pretty easy if you have seen it done before and some sort of manometer or gauge.</p></blockquote><p></p>