NOISES FROM THE ENGINE

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OK SO I GOT A CAR FROM A DEALER SHIP AND DUMB DUMB ME WAS ALL EXCITED AND I PICKED A CAR OUT APPARENTLY TO FAST AND DIDNT TEST DRIVE IT NOW I HAVE MY JETTA AND IT RUNS SO HORRIBLY THE ENGINE TICKS AND IT TAKES FOREVER TO ACCELERATE WHEN IM GETTING ON THE FREEWAY..I DONT KNOW WHAT TO DO IM A FIRST BUYER AND THEY GOT ME REALLY GOOD CAUSE THERES NO WARRANTY AND IM NOT EVEN SURE I CAN TAKE IT BACK AND PICK ANOTHER COULD SOMEONE HELP ME OUT WITH SOME HELPFUL INFO OR SOMETHING PLEASE