95 Trooper spark plug wires coming off plug (NEED HELP)

My car was miss firing (dogging) last week so I replaced the spark plug wires on Saturday (11/14). Three of the plugs were coming off of the cylinder. I replaced the pcv as well and put a new boot/bushing (whatever the rubber seal is) just in case it was a pressure issue. So today (11/17) I am driving to work and I feel it missing again, this time it was only one plug wire coming lose so far. Pushed it back in and no more missing. Am probably going to upgrade wires this time, but does anyone have any advice why this is occurring? My vehicle is a 95 SOHC 3.2 litre Trooper. :runaround: