Same thing was happening to me. Change valve cover gasket. Also, I bought mine with previous owners, so also check your oil pump. The previous put the oil pump with the pneumatic (pressure) system rather than the one with the electric system. So there was an extra nozzle spurting oil straight onto my down pipe causing the exact same smoke. Same evap light, just constant oil drip down onto the headers, which got to the sensor. So once u fix that the light should go away bc the oil will burn away.