Yes, as fordman said, clean both sides of the butterfly plate and then what I have done is take a clean rag and spray it down with some TB cleaner and cleaned the inside of the plenum. Just reach in there and wipe down as much as you can but don't spray directly into the plenum, just onto the rag. See if the symptoms go away. If not, you can at least eliminate those 2 options. As far as the CEL and reduced power message, make sure you hooked up the connector to the TB correctly and make sure your MAF sensor is completely dry before you install it again. I had the same thing happen to me and after freaking out and turning the car on and off a few times, it went away on its own.