That thing called a Battery, It too acts like a giant capacitor..... If it's getting old, 3 4 or 5 years, it could be the problem. If it's low, just as adding water to it helped to increace it's capacitance. I like to replace the battery every 5 years, especally before a cold snap in the weather. My 2004 coupe has the original battery, so i'm lookn to repace it this year in the fall. Yea my lights flicker also. Guess 'd beter check the water level.