On a 1999 Chrysler LHS, the spark plugs are located under the ignition coil pack, which is situated on top of the engine. To access the spark plugs, you will need to remove the ignition coil pack by unscrewing the bolts or clips holding it in place. Once the ignition coil pack is removed, you will see the spark plugs in the engine cylinder head. Be sure to use the correct size spark plug socket and extension to safely remove and replace the spark plugs.
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