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Recheck your firing order on the spark plug wires. Make sure the are connected to the right coils. #1 is on the passenger side. Make sure you didn't pull one of the plug wires apart when you were pulling on them either.
Sure it could if you forgot to hook it up.
You need to just go back over your work and look for anything that may be bent, broken, unplugged or leaking. If the problem started after you made the repair, then common sense says it was because of something you did. Make sure none of the plug wires broke internally from pulling on them. If those wires were original with 100K on them, they may be breaking the carbon cores internally. If they're original, which they are if they are numbered, they should be replaced anyway.