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I had something similar to this for a few months. I would feel a small thump as well. My idle was pretty stable though. If anything, it would change by 25-50 (needle barely moves). I changed spark plugs with no change in idle. But then I changed the coils a few months later and it cleared out the "thumping" and I gain back low end power and gas mileage. The coils weren't throwing any codes too.
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