Is anyone familiar with problems with lag when accelerating. I have a 2005 V6 automatic and it seems sluggish upon take off. I push the pedal and nothing happens until a few seconds later then I get that huge burst of speed. The delayed reaction is scary. How do I fix it? Is it easy for a not-so-car-smart girl like me to fix or will it require maintenance? ALso, I've heard of tuners....what are they and are they easy and safe to use?