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Hesitation at mid-throttle can be caused by cracked spark plug cables or cracked coils. The best way to diagnose whether this is the cause try to give it full throttle when you first notice the hesitation. If the hesitation goes away when you floor the throttle while driving you have found the problem.
The explanation is that the voltage needed to generate a spark is highest at mow load and mid revs. That will cause the spark to jump the cracks instead of the plugs.
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