sputtering

I know I am probably just a dumb female , clueless when it comes to engine performance in a car ...thats why I am here !! to seek advise from people who arent clueless. My car has started sputtering/missing when I take off .....occasionally when I am idle ..and its also started doing it on the freeway. I have taken it to a shop but they cant determine what the cause is because my check engine light isnt on. I have changed the plugs,wires, and fuel filter. I have tried fuel injector cleaner ...all of this and still it continues to sputter. can anyone PLEASE offer me some advise ..I am about out of money here and running out of ideas as to what is wrong with it. HELP !!!

Only thing i can think of here is you might have a bad spark plug and/or a bad wire. I'd recheck the spark plugs and the seating of the wires. Make sure the plugs are not cracked. If the rear plugs have the metal insulators, remove them for now.
Good Luck.