I have a friend with a 1989 Toyota Camry Wagon and the idle occasionally gets stuck at 2000RPM. In order to get the idle unstuck, we have to press down the gas, kick up the revs and then it will settle back down to a normal idle around 1000RPM.
I thought I might be able to fix this by cleaning the throttle body butterfly valve, but it didn't make a difference -- idle still gets stuck at 2000RPM.
Here are before photos of the throttle body:
And the photos after I sprayed Seafoam in there and scrubbed it with a toothbrush:
Not clean enough? Any other ideas for what I might do to troubleshoot this idle sticking at 2000RPM?