Originally Posted by younggun
what is the best way to locate illegal air sources?
Best and only way is to take the time and thoroughly inspect each hose to make sure it is not cracked or brittle, that the hose is still pliable / intact / in good condition, and that each clamp securing has good spring tension / not rusted / in good condition ..
Visual inspection is important, but "getting your hands dirty" by checking each hose for dry cracks, etc. is just, if not more, important when checking hose condition,
using a screwdriver, pliers, or 8 / 10 mm socket to check hose clamps to make sure they are secure is recommended.
Once you've eliminated illegal air causing the high-idle condition, (if it was me), I would be pulling the metal intake plenum and giving that IAC valve & ports in the intake plenum a good cleaning next,