Sometimes, the gas pedal of the RAV4 will feel like it's sticking, or
offering more resistance that usual.  This problem may come and go,
but tends to become more pronounced and frequent over time.  The 
problem is most likely to be a dirty throttle body.

Cleaning the throttle body is not a difficult job, but your dealer may
charge a lot of money to do it for you.  Here's a procedure for how 
to do it yourself from Thomas A. Yurick <designer@penn.com>:

"Try to park the car so that the drivers side is slightly downhill. 
Open the hood and find the clamp that holds the big rubber air intake 
hose to the throttle body (the big rectangular aluminum "box" that 
sits on top of the engine). Loosen the clamp a few turns until you 
can work the hose off. There isn't much clearance around the opening, 
but if you're careful you can move it slightly off to the side.

Place an old towel under the opening, and using a flashlight if needed,
spray carb cleaner like Gumout 
<http://www.pennzoil-quakerstate.com/products/gumout.htm> 
all around the butterfly valve and the related linkage. You'll be amazed 
at the crud that will run out. Have someone work the gas pedal back and 
forth a few times while you spray until it seems to be clean. Allow a 
few minutes to dry and *lightly* spray a pure silicone oil on the point 
on the inside that the linkage enters the throttle body. Dispose of the 
towel safely (it will be combustible) and replace the air intake hose 
and tighten the clamp securely."