knocking engine

1999 jeep grand cherokee v8 3 weeks back i replaced 6 spark plugs on the engine could not do all 8 as i was not able to get to last 2. Yesterday i felt knocking when i was driving and engine light came on. i am going to open it up and check the sparks plugs again, but if anyone as any ideas let me know, thx
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Rahul
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L.W.(ßill) Hughes III

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