Hi i have an comptech supercharged 07 civic si last week i drove from my parents house to a couple stores it started just fine. went to walmart came out after 15min and my car wouldnt start. iv changed the battery and the sparkplugs, and the fuel pump relay. the fuel pump works the ingnition coils are good it wont start it turns over but wont start if the car sits for w few day it almost starts and the dies iv tried useing starting fluid but still nothing witch leads me to believe its something electrical. anyone have any ideas what else it could be ?