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Although plugs come pre gaped it is only prudent to check the gap before you install them.
Look each plug over and check the gap...the condition of the porcelain...the sealing washer.
Same thing if you install new coil packs. Look them over....make sure there are no manufacturing defects check that your wiring connections are clean and tight.
Make sure the contact point of coil pack to plug is clean.
Make sure they are fully seated on the plug.
Make sure the part you are installing is correct for the car.
Never assume that a new part is good just because it is new.
simple things like this can save a lot of headache and tail chasing.
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