Help guys. I dont know whats up. Yesterday i am driving an dmy speedometer goes up and down like crazy. Btw im boosted on my gsr. Well Im cruising and the out of nowhere my speedometer goes up or down and goes out of control when i hit the gas. When i hit the gas hard it will go the right speed on odo but out of nowhere drop to 5-30mph or go up. Can anyone please help. What needs to be replace?? What seems to be the problem???