2000 Es300 No Cel, But Stumbling, High Short Term Fuel Trim

[incharleston]

My 2000 es300 seems to hesitate or stumble when giving the car gas after a complete stop. This seems to ONLY happen though once the car is at normal operating temperature. Also, it only happens when the car is in drive. I'm leaning towards one or more fuel injectors being bad. I bought a $200 scan tool it indicates as much as a -20 short term fuel trim. Am I on the right track? Any thoughts or recommendations would gladly be appreciated.

Thanks

[Steve]

MAF Sensor, or Intake Hose Split or leaking air after the air intake sensor.. its a corregated hose that tends to split.

Just a couple of things to check first