Nasty, Nasty, carbon buildup on these 3.6 engines.
I would be running Seafoam in the Gas and Oil as regular maintenance.
Lots of carbon on the piston tops and consequently in the ring lands too > stuck oil ring and lowering the compression.
Very complicated engines. Dual overhead variable cams, chain drive oil pump. Lower and upper oil pans.
Not to mention the failing valve seat and failing exhaust valve problems. Bad Heads.
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2003 Chysler 3.3 and 3.8 roller pushrod engines are looking pretty good right now. Much much simpler and easy to work on.