Ok so I'm usually pretty good at figuring things out and fixing them on a car. But now I'm stuck. My aunt has a 2004 accent with the 1.6L 74k miles. Started having billowing white smoke. Ok coolant issue. Check radiator, oil, reservoir, all full and no mixture. Coolant pressure test showed no leakage. (Done at Firestone on that one) checked for moisture in fuel, injectors are clean, pressure regulator is working. All the wear and tear items checked for anything wrong. Only thing I haven't done is a pressure test on the cylinders but replaced all the plugs. Nothing out of the ordinary on the plugs. No contamination, detonation, excessive carbon build up. Misfire code still on, MIL flashing but misfire is only code. Engine running smooth, no loss of power. I'm sure I'm missing something. Please point me in the right direction.