My fuel injected engine has a little port downstream of the MAF sensor and the throttle body. I remove the threaded plug that's in the hole and replace it with a tapered birch dowel that has a hole drilled down the center of it. I insert the plastic straw from the can of fogging oil through the center hole in the dowel and use the dowel depth to set the engine speed (it acts like a throttle in this situation) while I spray fogging oil. It works very well.
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