The car has trouble starting, lopes in idle like a v8, jerks, and misfires a lot. I'm pretty sure the timing belt is going out based on those and having replaced fuel and ignition components that could cause it. I am planning to buy a Gates brand kit to install. Very recently the car constantly jerked during acceleration and then randomly stopped jerking and I am wondering if I will need to correct the timing in some way before installing the new belt. Also what are the chances of my valves being damaged?