OK, so my EGR valve was bad and has been replaced. The throttle position sensor isn’t giving any error mesages now, so Steve didn’t have to replace it. So car should be working again. Now I just need to go pick it up.
The EGR (Exhaust Gas Recirculation) valve: Exhaust gas is routed back into the combustion chamber. But when it doesn’t work right? It can be open when it isn’t supposed to be, or it can be closed when it is supposed to be open. If it is open when it is not supposed to be open, at idle for instance, It will act like one monster vacuum leak and the engine will not idle or will idle really roughly. If it doesn’t open when it is supposed to open you will probably experience a “pinging” or “knocking” since the combustion chamber temperature will be higher than normal (one of the main causes of pinging in an engine).