My 97 Sentra is running rough, just out of no where started. Feels like an o2 sensor or timing but Im not sure. My friend pulled the cap off and said there was build up on the aluminum points and rotor, and the spark plug wires have white lines on the sides that were touching each other. The diagnostics center is closed today or I would take it. Also aside from the rough idle and run, it has very very little power to get up and go. You have to get the engine to kick down to get up to speed(55). Can you help?