1995 Nissan Altima spark plug wires won't go in and misfire

I had the spark plugs replaced and used old wires, which were replaced only one year ago already. when I recently had a water problem, radiator went bad, 3 of the spark plugs popped up and when I tried to pull the wires, the electrical part inside came apart. Car is driving but misfiring and sounding awful. should I just replace the wires and see if that solves it? It was dying at a stop and idle was erratic prior to this. Could it be the spark plug wires were put in the wrong place?
Thank you