SPARK PLUG & WIRE KNOCKED OUT OF VALVE COVER HELP!!!&# Options

[Bradley]

Hey guys,
driving back to school today I stopped at a red light, shifted into first starting going again and then bamm!! my engine started to sputand sound like a go-cart. I pulled over lifted up the hood and found my spark plug jammed up into the wire and the wire completely out of the hole.
I was able to start the car back up and pull into a parking lot but shortly after that it stalled and I was not able to get it started again (it choked but did not turnover)

So what could be my problem.
I disconnected the ignition wire from the distributor and am heading to auto zone to get a new plug and wire (if not a whole set)

Will this mean I need to replace the engine (finally 3sgte time!! lol) or can I just replace the plug and wire and be ok.

Did this upset my timing any
Could it be my timing belt snapped?

PLEASE HELP!!!

PS. I have a 1995 celica gt coupe