Ok here's what i have in my car:
Pioneer head unit(4700mp i believe)
4 5.25 polk DB series speakers
1200d hifonics amplifier pushing
2 infinity 12" referance series subs

Here's my problem. my car has become very jerky when driving. took it to the shop they said my car needed a tune up, done. now they are saying that the problem could also be that my system is pulling too much. I know i need a cap and they said that it's just a bandaid for the problem. THey say that the amplifier is draining my altenator, battery, and ignition(i believe that's what he said something like that). What are my options to help this out? More powerful altenator? hit me up with options. I'm going into the shop in an hour and i need some ideas so i don't go in blind.