You're right...I had confused the tumble flaps with the IMRC. Silly me. So where I'm at now is that I have verified operation of both soleniods; and verified the arms on both the TF and IMRC actuators freely move when vacuum is applied. So I'm actually down to electrical checks on the IMRC as of today.
OK, so I've been out playing this morning. When I rev the car up by hand, I can see the the IMRC actuator is extending when the throttle is opened to (I guess) around 3000-3500rpm. So that would seem to be working properly.
The only change since goofing with the solenoids yesterday is that the Tumble Flap solenoid...when I disconnected the short vacuum line between it and the manifold yesterday, there was no change in engine tone, like there was when I did the same thing to the IMRC soleniod. Today engine tone changes when I disconnect either soleniod at the same place.
CEL hasn't come back again as of yet.
Last edited by mwalsh; 10-20-2012 at 12:09 PM.