I have a 2006 Scion tc and I've recently had some problems with the positive battery cable. So I replaced it, and it ran fine for about 4 months. Recently it died on me and I realized that the negative cable wasn't getting a good connection, so I tightened it and it ran fine again for another day.
Now my car won't start up. It seems that i'm getting a good connection from the negative cable because I still have power to everything else(lights, clock, etc.). When I try to jump it off, it will start up fine but once I get over 10mph the RPM drops tremendously and the car begins to die. All of my power starts flickering before this happens, the clock turns on and off, my lights lose power and my windows won't roll down.
Does anyone know what could be causing this? Should I try completely replacing the negative cable, or could this be caused my something else(dirty airflow sensor, bad alternator, etc.)?
Thank you for the help everyone!