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The engine is likley misfiring due to faulty new ignition components provided they were installed correctly. I would recommend to check the code stored in the computer as this will tell you which cylinder is misfiring. Then from there, go check the new ignition components that were installed on that cylinder. The spark plug or ignition wire is likley at fault.
Another thing you can do is manually check to see which cylinder is misfiring by removing one spark plug wire from each spark plug one at a time while the engine is running. You would use a insulated plyers to do this and which ever one does not affect engine rpm is the cylinder that is misfiring. Then you know exactly which cylinder is misfiring. From there, you can swap that spark plug with another spark plug to see if the misfire follows the spark plug when you install it into another cylinder.
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