problem

Clean injectors

check the wires, injectors, make sure the new plugs are gapped correctly also check the throttle position sensor

Replace wires

did the check engine light come on? that is the best way to tell whats wrong with the car is to scan the codes and see what the engine code if any were thrown. other than that it could be any number of things. i dont want to scare you, but the tp sensor can cause a miss, but there is also the crank shaft position sensor, which could be faulty, or the camshaft position sensor, which ever the vehicle has. faulty mass airflow sensors and manifold absolute pressure sensors could be your problems as well. but without knowing if the check engine light is on and if there is a dtc present, you would be throwing parts at and not fixing the problem, which would end up costing you alot of money.