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Q: caddy is misfire on 6 running bad need help on 2003 Cadillac DeVille DTS

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I have 03 caddy dts with mis fire on number 6 I changed cam sensor and coil pack still saying misfire running ruff
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Just a thought, today I had an '02 with misfire on #2. Valve cover gasket leaking, 1.5" of oil in spark plug tube.
Check sparks plugs. If these are okay, I would suspect a vacuum leak to one of the hoses on the intake. Usual suspect is the pcv hose or the rubber elbow on it. You can spray carb. cleaner on the hoses (while vehicle is running) and listen for the engine idle to change. If it does, you have found your vacuum leak.
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