checked the sparkplugs yet?
IAV: is on the plenum (photo1).
Remove the electrical plug.
winding test: Put your ampmeter to the 2 terminals and check resistance (you should get somewhere between 7-11 OHMS [correction!])
Cleaning: Remove the hose (don't break it!) Remove the one allen head bolt holding that metal "C" clamp underneath and remove IAV. Spray inside with brake cleaner and shake about. Then a short spray of WD40 as a lubricant, once the brake cleaner has evaporated away.
Check the rubber bung it fits into, in the plenum itself, is not too loose a fit (I use silicone grease to make a good seal)...this is one source of an air leak.
VVT static check: remove the rubber boot. There are 2 connectors (photo 2). Remove these. Apply 12V (you can get 12v + from that black main terminal block - always live - on the driver's side fender, one of the big red wires) to one VVT terminal and a ground wire (say from the cam cover bolt) to the other terminal.......The VVT should click and you will see the solenoid pop in and out. If it does, good, the solenoid is working!
VVT running check: remove the 2 electrical connectors as above, and start engine, reapply the 12V as above, and hold the power to it for some seconds, and the car should idle terribly (apparantly it does already
) and almost want to die.......If it does the VVT mechanism itself is advancing the cam timing and is working correct.