I decided to clean my throttle body (my T4R has about 66k on it). Was it worth it? I don’t know yet. I do know throttle tip-in feels a bit more responsive and the rpm corrects a little quicker as the A/C compressor cuts on & off (while idling).
I also removed the MAF sensor to clean it, it was spotless. This is the 2nd time I have looked at that, bot times it was good. Toyota made great strides 3rd to 4th gen as far as this issue concerned. The 3rd gens seem to benefit from cleaning the MAF sensor.
Tools: 10mm, 3/8 drive socket, short extension, needle nose pliers, a couple of dabs of grease, cleaner, rags.
Product.
1st two nuts to be removed.
Next lift the front of the cover and pull it towards you. It'll come right off.