While stopped or when moving, sometimes engine does not respond to depressing the gas petal.
After about 800 miles, my vehicle began making a loud clattering noise at start up. now at approximately 15k miles, the vehicle has been returned to the purchasing dealer to rectify this problem several times. a hyundai representative deemed this loud obtrusive noise normal. he stated it is a timing chain tensioner that is causing the noise. he also states the tensioner has to be "primed" during initial start up. i replied, if this is the case, why it took 800 miles for the noise to become audible? he repeated his statement by saying this is normal. i then replied, in no shape form or fashion, this is normal. the noise is so loud, the representative and no choice but to say he herd it, but now says it is normal. after completing some in-depth research on hyundai's 3.3 liter lamda engines, the clattering noise has been reported countless times to hyundai. although my vehicle was purchased new and still remains under factory warranty, hyundai has refused to correct this obvious engine defect. now while coming to a stop, the vehicle idles fine, then the rpm's violently drop to around 500. after several seconds, the rpm's return to its normal, 750 rpm's. i returned the vehicle to hyundai concerning this problem. once again, they deemed normal. to this date, hyundai has refused to honor the factory's warranty on any of my vehicle's obvious engineering defeats.