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3.5 motor noise in 2004 concorde lxi

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looking at a 2004 concorde lxi

the motor has a bit of a knock/rattle in it.

Sounds low in the engine but i can only hear it clearly on the drivers side and it almost sounds like it is coming from the rear of the engine but is a bit hard to tell. It is also a bit intermittent and seemed to fluctuate a bit with the AC on and when shifted from R to N to D and back and forth.

didn't really make any noise when first started "cold" kinda cool here today.

Anyone run into this before? likely rod knock or flywheel/torque converter noise or something else???


Thanks.
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