Okay, so you changed the spark plugs, check the face of the plugs and see what they look like. They should not be black with soot. Also change the wires since it is possible that they are cracked. If no result from that, it is possible that the Camshaft position sensor is not working right, as well as the Crankshaft position sensor. Clean the Idle air control valve, or replace it if necessary. The only other thing I can think of right now would be to clean the Mass air flow meter and definitely check the coils.
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