Debris can get into the idle air control valve. This will restrict the air flow into the engine, causing idle speed and/or stalling when cold. The valve can be cleaned or replaced to correct this concern.Google+
Car Problem Reports
Lexus RX300 Debris in Idle Air Control Valve May Cause Engine Problems
Lexus RX300 Problem
Engine Affected: 3.0L V6
Average Mileage: 133,707 mi (50,400 mi - 250,000 mi)
Visitor, 2002 Lexus RX300, 3.0L V6, 140,000 mi
feels like its going to cut off when in idle. Car starts shaking and have to hit the gas to keep it running. Once moving at a decent speed in drive it feels fine.
Visitor, 2001 Lexus RX300, 3.0L V6
Poor idling, engine lights on as is VSC
Visitor, 2000 Lexus RX300, 3.0L V6, 115,000 mi
Would not idle and jumped around at stop lights to the point other drivers would stare at me. High dollar repair shop said it had to be replaced at $600 area. Went on line and saw where some were being cleaned. Went to another shop and they cleaned it overnight. Soaked it in cleaning fluid( build-up of carbon) and had no problems since with that part.
Visitor, 2000 Lexus RX300, 3.0L V6, 145,000 mi
idle control needed to be replaced. My car kept idling low and kept stalling. Took it the repair shop and paid $325.00 to get it fixed. Check engine light has come back on though and now it will not start at all. Headed back to the repair shop.
Visitor, 2001 Lexus RX300, 3.0L V6, 104,000 mi
Very low idle, could not drive gave P1150 code.Had to replace valve.
Visitor, 2002 Lexus RX300, 3.0L V6, 250,000 mi
Several times starting, and stalling at intersections.
Visitor, 2001 Lexus RX300, 3.0L V6, 150,000 mi
I continue to add a quality fuel system cleaner monthly and the problem goes away! Most of the time it would happen during the cold months, not so much the rest of the year. I would replace or clean the IACV but I have given up the back yard mechanic repairs (just don't have need to do it). If the problem gets to the point that fuel system cleaner fails to do the job the RX300 will go to the shop for replacement. Current milage is 240,000 (approx).
Visitor, 2002 Lexus RX300, 3.0L V6, 155,500 mi
Car wouldn't stay "on". Had to pump the gas pedal just to get it started. Idle valve was replaced; cost me over $800 for part and labor.
Visitor, 2002 Lexus RX300, 3.0L V6, 150,000 mi
Willnot idle. Engine dies if dont rev engine. Ok when engine gets warm. Have to power bake to drive.
Visitor, 1999 Lexus RX300, 3.0L V6
After cleaning iACV, RPM very high. Up to 2000 on idle, still ca not solve problem