Dodge Spirit Mechanic Problems Year 94

I have problems with the Dodge Spirit year 94.
The car turns on but does not grab the changes, the speeds. He previously rolled but sometimes felt it without strength and gave strong jalons. Take it to a mechanic I pass the Scaner and say it does not throw any error. The oil of the automatic box is changed and nothing. He does not find the fault. Can anyone tell me that you can have the vehicle? What failure can you have?
I don't know what to do.