06 kia Sportage 4WD- can anyone define my issues and what i need to have done.

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The car test drove wonderful. Made payment drove approximately one mile stopped,fueled up. Upon starting motor didn't want to keep running. I forced it fuel to make it run, at that moment it felt the trans was slipping around 2nd to third causing rpm to excelerate and loss of speed to vehicle. continues to repeat unless I manualy shift the motor my self. Once in fourth it runs out decent but had a humming or winding and seems to be holding back.