Indeed it is a common job for most mechanics. A word of cautious, it is not advisable to take out the throttle body from the engine if the mechanic is not well verse. It may (less chance but still got risk) damage the stepper motor.
However, if just DIY like what is shown it is safe, the throttle body still attach with the engine.
One more thing, better not use WD40 to spray behind the butterfly plate,as the sensors may give problem. Ok for plate on the outer side.
For behind the plate, better use Electronic Cleaner. The most common will be CRC Electornic Celaner that is available at ACE hardware or Brother's Kelana Jaya (HQ) at about RM 22-25 for a medium size bottle.
Pic refer to below:
http://www.acehardwa...oductId=1451535Of course, the best to use is to CRC MAF sensor but much harder to find in Klang Valley.
For Kuchai Lama area, you may want to try EON outlet diagonal opposite KFC & Pizza Hut standalone restaurant , but as usual the labor charge on the slight high side.