1996 Altima Spark Plug Wire

I have a 1996 Altima and the spark plug wire just started popping off when I drive the car. Normally I just drive the car for 10 minutes, but I noticed this occurred when I drove the car for over 30 minutes. I checked the post connection that plugs into the spark plug and there's oil on the end of it. It's not cracked or irregular in any way. I just replaced the gasket on the valve cover last year. I also replaced the spark plug wire last year as well. Anyone out there have an idea what may be causing this? Thanks

Eddie

If you have fresh oil on the plug wire, sounds like your gasket is still leaking. Start with that, and maybe a new wire.

Thanks, Had the gasket replaced today. Hopefully that will do it.