It could be a bad coil. See which spark plug wires have spark when cranking the engine over, and which do not have spark. You have a coil pack with 3 ignition coils. So one coil supplies spark to two cylinders. You may find two cylinders not firing from one coil.
SOURCE: not running right
your catalyst converter is stopped up this will make your exhaust pipe turn red
SOURCE: 2000 chrysler concorde no spark on #2 cylinder
If it ran good prior to spark plug replacement, then yes, I'd be looking real close at the plug wire to that particular spark plug. Perhaps it pulled apart inside boot upon removal. It may even be an indication that they are all getting weak, and time to think about a new set if it's originals.
SOURCE: exhaust manifolds glow bright red after driving 3
Check and make sure the catalytic converter is not plugged,or any part of the exhaust.
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