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Just an idea but use somthing harmless like engine degreaser.
What? Engine degreaser?? I don't know what kind of engine degreaser you use, but I wouldn't want that **** in my engine.
A can of carburetor cleaner is the best thing to use. It won't harm your motor. Spray it around the vacuum lines and the intake manifold, the idle should go up when you are in the right area. That should get you close.