I definitely would get this checked.cIts dangerous.. It might be something is hanging it up. My guess is on top of the motor at the carburetor... Something is not letting it releases..Might be a bad spring or something is grabbing it not letting it release
Check around the mats and make sure it's not hanging up on this. Also be sure it's clearing the firewall and not her is interfering in the engine compartment
SOURCE: RX300 Engine Stalls when I take foot off the gas pedal.
The Idle Air Control (IAC) valve is clogged. This part feeds air to the engine at start-up and idle when the throttle bodies are closed. I removed the throttle body assembly from my 2001 RX300 and separated it from the IAC. After a good cleaning with throttle body cleaner the IAC was good as new. I later decided to replace it during routine maintenance. You can pick up a brand new IAC on eBay (genuine Lexus/Toyota part). The dealer will want upwards of $400.00 for a 45 minute job (all you need are basis hand tools).
SOURCE: LEXUS 1991 ES250- WHEN DRIVING 20 OR 30MPH AND I
need to change out your throttle control module.
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