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2005 Dodge Grand Caravan crazy engine sound

2005 Dodge Grand Caravan crazy engine sound

i have a 2005 Dodge grand Caravan and have a weird sound. I uploaded a video on youtube with the sound. the link is https://youtu.be/6l6Bzrm_0oU Can someone help, trying to figure out. I think it might have something to do with pistons, but not sure. Thanks.