well..I got a front end damage so I change hood and bumper also I put air charger and high performace maf sensor. It was in the body shop for 2months. Well..after that I am trying to take out of bodyshop and it knocks and pings if in the park barely hear but if you drive you can hear clearly if follows gas pedal if you push it hard then disappear. Is it fom air charger and high performance maf?? running fine except changing gear 1st to 2nd, I got auto and I feel little jerking. only 12000miles in it. I put sea foam in the gas tank cause it was sitting in the body shop for 2months. Give me some help....Someone told me computer got to be flashed. I know that noise usually disappear when it is warmed but not this one. Any idea?? I am going to fill up tomorrow with fuel injector cleaner. I just got the car yesterday and never change so far. By the way, with air charger and performance maf it runs better but noise bugs me.