What is causing a knocking noise in the engine after replacing the back 3 spark plugs on a 2005 kia sedona?

A knocking noise in the engine after replacing the back three spark plugs on a 2005 Kia Sedona could be caused by several factors. It's possible that the spark plugs were not installed correctly, leading to misfiring or improper ignition. Additionally, if any debris fell into the combustion chamber during the replacement, it could cause knocking. Lastly, check for loose components or issues with the ignition system, as these could also contribute to the noise.