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you seem to be snatching at straws. that is ok. many do. panic sets in.... its a machine and all fail. You have dangerous high idle speeds, this is dangerous. why not seek help. any mech can find this, Any!
The car has EFI , and idle controls. A/Cs sets faster idle , by about 200 rpm , 800 hot , to 1000 hot (in general) The car has an idle speed controller that is failing. there are other ways for this to happen, all complex. 1: intake manifold air leaks. 2: some dork, spun the distributor guessing at timing, fire him. 3: ISC bad. (or IAC) electric idle or thermo idle controls 4: throttle linkage jammed. (cruise, throttle or A/T kickdown) 5: or Toyota disease, the floor mats are hitting the throttle (dumb) there are more.. it takes tools to fix cars, and know how. do you have tools? that includes gauges. guessing is expensive. ask any mechanic to look, its not costly for just a look.
sounds like you may have a vacuum leak. any air entering engine not passing through the throttle body will cause engine to race. a whistling sound is sometimes a sign of vacuum leak but not always audible. propane is the recommended method finding leak but I find this unreliable. spraying carb cleaner around suspect areas and listening for a rpm change is more successful. just remember carb cleaner is extremely flammable and caution must be used.
You don't say if the engine is carb or fuel injected. If it has a carb, it could be sticking linkage for the fast idle to the choke. If it is fuel injected it could be a faulty idle air control valve. Or it could be something holding the throttle open like a binding cable.
No not a leaking injector would be running very rich.What I would try is remove in take air duct at throttle body and cover with palm of have so no air can go in there and listen for air going in some where else.
Idle speed is not related to the clutch position. With the pedal depressed, the engine is freewheeling and is not engaged with the remainder of the driveline. Likely the idle speed is the same with the engine running in neutral or with the clutch depressed. check the idle air control and clean the throttle plate in the throttle body as well as checking the throttle cable for binding etc. If there is a small vacuum leak, that also can raise idle speed.