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Check firing order, then check if gap is wrong onone plug, or one got cracked. With engine idling, remove plug wires on at a time(assuming firing order is correct)and the one that does slow the engine down should be the culprit. Be careful!
Faulty MAP or MAF sensor, EGR valve stuck open, spark plug wires don't match firing order, large vacuum leak to intake manifold, very dirty fuel injectors, idle air control valve defective, poor compression in cylinders due to incorrect valve timing or leaking fuel injector o-ring seals.
2006 model?? dealer only encrypted software ,my advice is if it runs ok when driving normal then leave well alone ,this flat spot could be present to allow for something in the normal running ie tuning to keep the economy up ??
Check and make sure your distributor cap and rotor are not corroded and gunked up. If a spark plug is ever dropped, the center electrode could be cracked leading to a improperly firing spark plug (causing a misfire). parts get dropped during shipping all the time.
You can have car put on scope and it wll show any irregularities in the ignition system. It can also be dowithout any equipment. First, loosing ALL 8 spark plug wires, Now place the spark plug wires loosly back on, just secure enough to secure. You might need 2 people. Being the miss is more consistant in gear, APPLY THE EMERGENCY BRAKE , put trans into drive and raise rpm's till miss is obvious. Remove ONE plug wire at a time, TILL THERE IS NO DIFFERENCE IN MISS. Thats the cylinder missing. Start with the spark plug, inspect, work back to wires and cap. An EXTREME result will be NO COMPRESSION.
I would say it very well could be a coil pack i have had the problem before.. I buy one and put it in all the spots till you find improvement if no improvement return the part... Could also be spark wires or plugs.. On mine i had a hesitation mis fire type thing was the mass airflow sensors intake was mashed down and sensor was dirty hope this helps..