Bit of an odd one.
I have a 2001 Neon, approx. 160,000km.
Car started was idling a bit rough this morning for about 20 seconds
after startup. I decided to check the plugs. The spark plug tube in
the (I believe) #2 cylinder, had risen up about 1/4 inch above the top
of the valve cover. This resulted in the spark plug wire not making
solid contact with the spark plug.
I checked inside the spark plug hole and did not see anything out of
the ordinary.
After tapping it back down with a mallet, I took if for a 15km drive
(bit of city and highway run).
I checked the tube again, and it had risen a bit, but not the 1/4
inch.

The car is running good, smooth idle after reseated the spark plug
wires.

Has anyone seen this?
Any ideas as to what would cause this?

Mike
mlawrenc(at)gmail.com