rtfl- There are definitely supposed to gaskets on both the air intake tubes. I assume you mean where the intake tubes bolt to the throttle body. That may be the cause of it not idling. How long has the non-idle situation gone on? You can check the electric coil with and ohm meter. The manual says the resistance should be from 17.0-28.5 depending on whether it's cold or hot but I believe I have read that is a mistake in the Lexus shop manual. When I cleaned it on my DIL's RX it worked perfectly afterward while one side read 2.0 ohms and the other side read 59.0 ohms. I replaced it anyway because my DIL was going to be a long ways from home in a vulnerable position. With it off the car but the plug connected, watch the cylindrical opening while you have someone turn the key to "on" (NOT START). the cylinder should move to fully closed, then fully open and back to rest at half open, all in 0.5 seconds. (1/2 sec.) If you replace the gasket that is missing and check and see that the valve DOES operate as it is supposed to (off the car), I'll send you one of the wave washers. Some have said it works fine without it. I don't know exactly why it is there. If it doesn't function properly with that test, you'll need to replace it anyway, and the new one will have a washer in it. Let me know how you come out.
code58 - Thank you so much for your detailed and helpful response. After testing, fiddling and reinstalling the TB intake tubes with the proper gasket, everything is back to normal! I don't think I need the washer, but really appreciate your offer to send one.
I can't express enough my gratitude to all the knowledgeable people who contribute to this forum
