My 2009 Honda Civic XL is giving me a headache. Every since I bought the car I have had problems with hesitation while accelerating the car (especially on the highway). My local Honda dealer said there was a slight handling problem and supposedly fixed it soon after I bought the car. I have been back to the dealer a few times over the past few months to deal with this problem and he says that he cannot do anything about it until he has the same problem while test driving it. I am really displeased what is happening with this car; what should I do? I should mention that it is still under warranty and that I already sent a letter of complaint into Honda and to my Honda dealer.