What would cause a misfire,changed coil pack,plugs,etc,what else can it be??

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Bad sputtering sitting at red light or just idling,take off is a little rough like no gas is getting to the fuel pump?changed coil pack,boots,plugs still no change computer reads bad boot but I've replaced those,don't know what else to do,need to repair myself cause shops are ridiculously high for this type of car.please help.. TIA