I recently installed audio system in my 02 Taurus. I have 2 12" American bass xfl's , Hifonics brutus elite 2000.1d, 2 optima yellow tops, with the big 3 upgrade. Worked fine for a couple weeks. Now when ever I have my system turned up the car seems to start chugging and it only stays around 2000 rpm... When its turned down its seems fine. I have a stock alt. But my lights barley din on full volume. Any ideas anyone?