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The original vacuum lines can become very brittle over time, and you may not see the cracks if the split loom covering is still on them. Don't spray flammables on a running engine - use a 3' section of garden hose as a stethoscope, or buy a mechanic's steth. (~$12 from Snap-On) & remove the hard probe. Listen ALL over the engine at idle; any leaks (exh. or vac.) will be obvious & easy to pinpoint. Also check under the dash where the brake pushrod goes thru the firewall, and around the cruise servo.
Click my black Bronco in my sig, scroll to the bottom of the list, & read all the TSBs that apply to your truck. There are several about the IAC, so check the captions, too.
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