$ dilemma: what to do w/ a 30K eq line of credit@8.5%?

This equity line of credit pymt is steep for me. Rec'd offer for credit card 2.99APR fixed for life. (1st Natl Bank of Omaha) Is it better to open the credit card with the 2.99 for life? The int. won't be tax deduct. but the pymts should be more manageable. My firs mtg has 5.99 fixed & I'm 4 yrs into it. I think I should keep it as is. Thanks for any advice.