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I think you've nailed it. Check all your rubber tubing under the hood. Also spray some WD-40 or B-12 on the seam where the intake meets the cylinder head. If the engine speeds up, you've an intake leak. If you find a hose with a hole or crack in it, and put your finger over the hole and if the engine speeds up, replace said hose. If all else fails, you might have a vaccum leak INSIDE the engine (I've had those bite me as well) from the intake manifold. While your at it, check you linkages from the gas pedal to the fuel injection (sounds like the linkage/cable is binding). Oil the linkage (if you have one) or replace the cable.
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