Spark plug wire keeps popping off

[kode3man]

Hi all! New to this site but my daughters 92 Camry has me looking for answers here. She has the 4 cyl base model and one of the plug wires keeps popping out of hole and off of the spark plug itself causing the car to run and idle rough. I originally thought it was a wire problem and replaced the wires but now it's doing it again. Every few days this one plug wire pops out and it needs to be re-seated.
Any ideas? A guy at Kragen told me that the housing around that particular housing where the spark plug is located may have a crack in it causing pressure to build up in the chamber and then pop, out pops the spark plug wire.
Does that sound familiar at all? I'm not a mechanic so we will be headed out to the dealer come Tuesday to have the problem checked.
Any help would be greatly appreciated....Thx

[Rattlin_Steele]

Does sort of sound like compression buildup. If it was me, I'd be tempted to sacrifice a wire set or put the old ones back on if you still have them, and poke a small hole in the rubber cap (but not too close to the wire itself) and see if that changes anything. Clearly this is something that needs to be remedied properly, but that might be a way to troubleshoot since it takes several days to occur. Spark plug not seated well maybe? Or cross-threaded?

Is there any oil showing up in that spark plug tube?

[bottlefed]

And if you pull it and there is not oil in the tube (although that is super common and happens all the time) check to make sure the plug it tight......

[kode3man]

Thanks to all for your responses! The weather is pretty crappy here so for now I am going to give the air pump needle a try. Will have to check the hole for oil. I just changed the PCV valve a few days ago and that didn't seem to help the problem. I know 145K is many miles for a Toyota but my daughters gonna go broke keeping this thing repaired all the time. Guess thats why all my Toyotas are new and get replaced every 150-170K miles or so. Her car is the first used Toyota I've ever had so i don't really know how it was taken care of in the past.

Got a 2006 Rav4 w/ a 6 cyl and I love it (Toyota #10 and lotsa power) and a 2003 Tacoma Double Cab (Toyota #9 and wish I would have bought a 6 cyl in it)