ok so i was goin to work the car threw a code then started acting funny...step on the fuel it hesatates then takes off sometimes its like the car wants to die..then it cleared i was doin a 100 k on the high way pushed the gass to pass and there was nothing for a few seconds a loud bang came from the exhaust and took off like there was never nothin wrong..the next day i try to start it and it would start rev to 1500 rpm "normal cold start" then fart and pop then die it done that 2 or 3 times now it wont start at all just flutter...i cleaned the maf and t/b took out the plugs they were black cleaned em up and still nothin...any sudgestions??? cat pluged?