I have an 01 mustang gt and here lately my gauges will flicker back and forth and radio turns off. I was thinking bad grounds but all my grounds are good clean and tight. Thought it might be battery connections, changed those and no change. I've noticed it does it wen the car jerks real hard or if a bump jolts it hard. Someone please give me sum info on this so I can get it fixed, I don't wanna drop the money for a gem module if it doesn't fix it.