Hi FJTest...I cleaned the MAF sensor (it looked pretty clean actually), and also added the fuel injection cleaner at my next gas refill.
2 follow up questions about the other recommended changes:
1) for the transmission fluid flush, I've looked at a lot of videos now on how to do that, and they always seem to replace the Strainer (part 35330-60050?) ...is this necessary?
2) Should I add changing the spark plugs? I am the 4th owner and the car has had 41k miles now. It's a 2011 FJ.
When you say you "cleaned the MAF sensor", are you ABSOLUTELY sure you cleaned the two tiny, delicate, difficult-to-see MAF sensor elements, and not the large "match-head" shaped intake air temp sensor? There are several YouTube vids out there incorrectly showing the MAF cleaning process.
Regarding the coarse screen at the AT pump pickup, there is no value in cleaning this during a routine fluid change. If the transmission has shed enough clutch debris or other material to even partially obstruct the screen, the transmission has far more serious problems than will be solved by a fluid flush.
Unless there has been some other fuel or ignition system fault, with only 41K miles on the plugs there should not be any compelling reason to change the spark plugs. For the dual VVTi engines, Toyota recommends the first spark plug change at 120K miles.
However, eight years is a long time for set of plugs to be sitting undisturbed in aluminum heads, and personally, I might be inclined to pull the plugs, "read" them carefully for any information they might provide about operating conditions in each cylinder, and then replace them with new iridium plugs (Denso SK20HR11). Apply a minimal amount of anti-seize to the threads and install to a torque value about 15% less than the specified torque (lubricated threads compensation). Then you can comfortably wait 100K miles until the next plug change.
(But, if you don't have an accurate torque wrench or a well-refined understanding of fastener tightening torque, don't eff with the plugs.)