Nema 14 stepper motor skipping

Hello,
I want to use a Nema 14 stepper motor to drive my extruder. But skips no mater how may time I change the settings.
I am using Pololu 200 Steps/Rev, 35×28mm, 10V, 0.5 A/Phase

My Settings are:
[[## Extruder module configuration]]
[[extruder.hotend.enable]] [[true]]
[[extruder.hotend.steps_per_mm]] [[1067]]
[[extruder.hotend.default_feed_rate]] [[600]]
[[extruder.hotend.acceleration]] [[5]]
[[extruder.hotend.max_speed]] [[60]]

[[extruder.hotend.step_pin]] [[2.3 ]]
[[extruder.hotend.dir_pin]] [[0.22]]
[[extruder.hotend.en_pin]] [[0.21]]

[[delta_current]] [[0.9]]

thank you for any help!

Imported from wikidot

If your motor is rated at 0.5A, you need to set your config’s delta_current at exactly 0.5A
About the skipping, please check that all 4 of the wires really go to the motor driver, and that there is not a wiring or connector problem, this is the most common cause of what you describe.