Could be the auto idle control valve, try cleaning before replacing (about $300). Another simpler possibility is the fuel filter,replace this first,
A high idle in a 1992 Lexus SC 300 can be caused by several factors, including a malfunctioning idle air control valve (IAC), vacuum leaks in the intake system, or issues with the throttle position sensor. Additionally, a dirty or faulty mass airflow sensor (MAF) can lead to incorrect air-fuel mixture readings, causing the engine to idle higher than normal. It's essential to conduct a thorough inspection to pinpoint the exact cause.
Thermostat is stuck closed.
The brakes :)
if it idles rough too, check your plugs, if not, check your fuel filter.
The Lexus ES 300 is front wheel drive and the Lexus GS 300 is rear wheel drive
It is caused by Bank 2 Sensor 2 oxygen sensor failing.
yes 1mz-fe
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