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The throttle body and idle air valve needs cleaned with carb cleaner that is oxygen sensor safe. Do not use standard carb cleaner. The hose that runs from the air filter box to the throttle body needs removed to access the throttle plate and passageways.
only upper sequence is throttle body is towards the 6 and 5 6248 5317 torque to 105 inch lbs. some upper gaskets are reusable if you don't break or mess them up but for the cost i would change them anyways.DON"T BREAK THE VACUUM NIPPLE!!! it happens with ease.
Have the same vehicle, a 2005 Chrysler Pacifica. Also have the same problem w/ the sticking accelerator. I dope it up real good w/ WD-40 and axle grease. It works for a few days, then goes back to sticking.
Drove over my $250 chainsaw the other day, wiping out the cutting bar on the saw.
When the boys in DC get off Toyota's case I hope they open an investigation on this defect.
Buy throttle body cleaner at your local parts store. Take the big intake hose off that is connected to the throttle body and air filter housing. Open up the butterfly (like you're controling the throttle at the engine). Spray this cleaner inside the throttle body, around the butterfly, where it motions back and forward on the pin. You will see a lot of carbon build up run out. Do this 2-3 times. It doesn't take a lot to clean it, just a couple of quick sprays. Wipe it clean with a clean cloth or rag. Put it all back together. It will seem hard to start for a few turn overs, but this is from the cleaner and it will dry out quick. What happens is, over time this carbon builds up where the butterfly closes and it gets (stuck) on this build up, which causes you to push harder on the gas pedal or it will not close completely. They charge will charge you like $250+ to do this and usually it's just build -up. Try it and let us know how it works for you. The cleaner $5