engine almost stalls on 1994 Lexus SC300

when cold it will sometimes act like it is going to stall,cleaned trottle body and change plugs

Asked by for the 1994 Lexus SC300
This could be a defective Idle Air Valve that is sticking, which is very very common on these engines. The car will idle close to normal when it is hot but will stall a lot when cold. If is was a vacuum leak, it would run better cold than hot because of the richer mixture. This is where I would focus my inspection.
If it is an Idle Air Valve, the part is about $335 and takes about 1 hour to install, be sure to get a new Throttle Body Gasket as well.
Thanks for the help!