01 Trans? Help!

My sister has a 01 sebring with a rebuilt trans (prior to purchasing) and the trans is acting up. At first it wouldnt shift past 2nd and it would just redline which i thought might be the input speed sensor... now she claims it dies when she tries to drive it. She hasnt been driving it like this its just moving it in and out of driveway. Would it still be the input sensor or would it possibly be something else?


Thanks

New problem.. when car is put in autostick the dash does not display what gear it is in... any experience this?