It really could be a lot of things, but you never answered the questions on hardware. If you have the exact same extruder I have you really need to take it apart and set it up correctly. they do not come assembled right. The newest ones even come clogged with the insulation material, every single one. Did you set your driver current? is the tension on the drive gear correct. triple check your slicer settings, it could easily be one of them. Screen shots and pictures could make this much faster. shooting in the dark is a slow painful process.