i just installed my amp and 10 inch sub and now my car idles like it wants to die??? its a 600 watt amp and a 10 inch sub with a 4 gauge wire to power it. my car also seems slower, its modified and tuned. why is this happening anyone know please help. could the spark plugs not be getting enough juice?????

 

you know what you did and you asking why the car is acting weird?
you are drawing the extra juice from the electrical system, do you have a voltage meter? you voltage is prob around 12 now.

did you install a capacitor?