I have no idea whats going on, the car was running perfectly, and then all of a sudden just shut off, it was at low rpms, when it did shut off it kind of did respond to me hitting the gas pedal, but not in a good way, it didnt rev up at all, it just shook around a little bit and sputtered. Once i got it stopped I tried cranking it, it turned over but did not start, if i kicked the clutch around it would sort of sputter like it wanted to start, but wouldn't. After a while of cranking the cel comes on, and the ecu throws 16 quick flashes (code 16 right?). Its strange that it fixes itself every single time overnight, any ideas as to what could be wrong?