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If you have a stuck valve, you'll hear funny hissing noises when cranking and should hear valvetrain ticking when the engine is running (excessive valve lash)...

Pull the plugs on 3 and 7, along with one from another cylinder, and compare how they read...describe what you see.

It's possible that the plugs are bad or fouled and just aren't firing...

Just take it one step at a time....
 
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