I HAVE A 86 NISSION MAXIMA I PURSHASD 4 MONTHS AGO. WHEN I GOT IT THE MAN SAID I WIL NEED A TUNEUP.THE MUFFLER WAS HELD ON BY HEAT TAPE.THE MUFFLER FELL OFF I PUT IT IT BACK ON.THE CAR MISSES WHEN I PRESS THE GAS.THE MONTH AND HALF IT WILL BACKFIRE AND SPUTTER AND DIE.SOME SAY IT MAY BE THE DISTISBERTER CAP OR THE CATILIC COVERTER OR THE FEUL FILTER. THANK YOU