Ok, im not sure if anything is really wrong or not. When im driving, not accelerating, just keeping a constant speed, Ill feel a slight hesitation, as if my a/c was kicking on. It happens for a split second then is back to normal. It doesnt idle rough at all and it drives like dream otherwise. I have 120,000 miles on it. I've never had a problem with my car and i'd like to keep it that way. Any ideas?