i have had a few credit cards and a car loan over the past couple of years, always pay my bills on time, but have noticed that my credit score seems to have just leveled out. I was thinking of adding another credit card but heard that new credit can weigh down your score. is this true? will my score literally go down if I get a new line of credit? should i just try to stick withthe old credit for best results? doesn't seem to make much sense!