HELLO ALL. aM NEW TO THE nw. I HAVE RAN INTO SOME PROBLEMS WITH MY JEEP. gRAND cHEROKEE lAREDO, 96 4.0. IT ONLY STARTS IN HOT WEATHER. I HAVE REPLACED THE CYTALITC CONVERTER AND THE SEVERAL THINGS AND NOTHING HAS CHANGED, IT SOUNDS TERRIBLE THE EXHAUST IS NOT BAD, TWO MECHANICS TOLD ME THAT ITS...