This is usually poor ignition, caused by:
Try swapping each one out until you fix the problem. Testing the components may or may not reveal the problem; many people have had components (especially wires) test ok, but perform badly on the car. Plug wires may also be loose in the coil pack, although they may look fine.
Other possible causes include
Those with an interest in spark plug theory will enjoy this post about Basic Theory of Spark Plug Operation.
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