Very helpful instructions and photos. Thank you all! Here are some additional comments:
I think that a hand impact tool with appropriate Phillips bits is essential for this job. You strike this tool with a steel hammer. This drives the bit into the screw head and also applies a turning force. All of my screws came out unscathed. If you don't have a hand impact tool, use this project to justify buying one! A light tap on the tool is all you need to reset a screw on reassembly, with no worry about your screwdriver "camming out" of the screw. Leave the lock grip pliers in the toolbox.
I removed the throttle body, complete with the idle air control assembly, intact. It seemed easier to disassemble the IAC on the bench. This also makes it easier to keep up with the small parts.
There is no need to cut the cable tie wrap. Squeeze the plastic clip and it will disengage from the bracket.
If the engine is cool, not much coolant will spill out of the hose.
Removing the black metal piece on top of the throttle bodies is easy and makes it a bit easier to engage the right hand throttle body unit when reassembling.
I brushed and sprayed solvent until no more black grunge was evident. I think the main purpose of the cleaning is to free up the IAC valve spindle. It should rotate freely. I added one drop of light machine oil onto the bearing.
When I restarted my engine, it idled at 2000rpm. Yikes! What did I do wrong? Nothing I could think of. So I drove off, and shortly the idle returned to normal and the engine now runs great. Perhaps the (software) controller just needed to recalibrate itself.
This is a very satisfying project, and saves big bucks too. :D
