seems to be electrical problem after sub/amp install
 

i install a 1800 watt amp and 2 kicker 12 in subs. first question is everytime the bass hits the lights and stuff dim, will a capacitor fix this? also when the lights dim i dont know if it weakens the spark of the fuel or what but you can feel it hesitate a little. my car has an idle problem to begin with but this makes it worse and want to stall at times when stopped so i always have to turn the radio down a lot to help out a little. im curious if this problem was there before the system and it just makes it more apparent now with the extra draw on the system and maybe thats why we havent been able to get it to idle properly....14 hrs on the dyno....about 12 of them working on the idle alone(surging/stalling problem). seeing as the tuner im going to is 1.5 hrs away i really dont feel like going back every week to attempt to have it fixed with no avail so im gunna do some other checks to make sure its got nothing to do with the tune

A big cap will help the problem, but won't entirely eliminate it. The only way to fully eliminate it would be a dual battery setup.

who makes a good cap for a decent price?