low idle speed (less than 50 rpm) at cold engine start, but OK after a minute

What is your question?

96 Lexus ES300 sometimes (especially when car left un-driven more than two days) get low idle speed (less than 100 rpm) at cold engine start, have to step on gas pedal slightly to keep it running. But a minute or so, idle goes back to normal. Sometimes I also get high idle speed at cold start(ie: more than 1500 rpm). I've cleaned intake throttle, idle air control valve, and MAF sensor about 9k miles ago, but problem still persisted. Not sure if this is indication that idle air control valve or throttle position sensor is going bad. Any advice would be appreciated.