From indiangunslinger; It sounds like to me you may have purchased some bad gas. #1 make sure you always use 91 octane. Do not use ARCO gas. Do you have a K&N filter so your car can breath properly. This is not standard equipment but it can be purchased at Kragens or Pep boys or on line. There is a charge kit that goes with it. About $50.00 dollars for everything. Good Luck.