Massive electrical problems. 1. While going 10 miles an hour, the speedometer jumps to 120mph then to 50mph then to 120mph again. 2. When I fill up with gas, the gas gauge states that the tank is still empty then moves to full then to a 1/4 then to full then to half etc... 3. While driving at night, my headlights go highbeam to low beam as if I am manually flashing my lights at other cars. I have read on the internet where this is happening to many many people with this same model of Chevrolet SUV and... read full review »