i scanned the code tonite with my obd2 and it came up p0442, which i heard is related to the evap system. could it be my gas cap. car is modified with srt intake but its been on the car for 2 years with no codes ever. so i dont think its related to this. i recently filled up the tank last week and it didnt throww the code till 5 days later, checked the cap and its tight so i am thinking maybe a bad cap? please help thanks in advance.