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Q:

ihave engine code po170 fuel trim malfunction bank1 on 1995 Lexus ES300

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the car is hard to start but once sarted runs fine
(1) Answer
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That code on other year Lexus is usually caused by a dirty or failing air flow meter but not really common on the air flow meter on your car. You could try cleaning the throttle housing with chemtool making sure the throttle housing /butterfly are all clean, then check for vacuum leaks around the intake manifold and air filter housing to throttle housing air induction boot.
After that I would suggest perhaps the idle air control valve under the throttle housing may be dirty and stuck open. Does the engine stall after first start up or do you find you have to raise the idle by putting your foot on the accelerator when you first start the engine from cold? All signs of a dirty idle air control motor.