frustration!!Car Dies when Headlights are on?

[BillyTheChamp]

i have no idea what my cars problem is.. i have a sr20 red top in my s14.. tuned on my safc II.. the idle has always been weird but started going crazy after i changed my fuel filter.. it's lot more steady at idle but when i press the clutch to coast my idle drops down to 300 or so ,(doesn't die in the day time, and goes back up to about 700-800rpm.. at regular idle its round 1050.. so when i come to a stop it goes from 700-800 back up to 1050 or so.. the weird thing is when i drive at night and when my headlights and acc lights are on.. my car's idle dipps and doesnt come back up.. it tries to but then just ends up dying.. i thought it could be my bov but why does it only happen at night (i have blow through method).. i thought it was my alternator.. but the car's battery doesnt drain and car stays on even if i remove the battery.. i can also restart the car right away after it dies.. it must possibly be an electrical problem right? i still hit full boost when i punch it as well and dont see a noticable loss of power.. im getting real frustrated and am thinking of selling my car if i cant solve this problem.. oh yeah im running a gt2871 60 ar. tuned at 15 psi.. can lack of grounds be the prob? i only have 2 in the engine bay.. i have a multimeter but have no idea how to use it.. please help..


Billy