LS1 started sputtering/knocking while at a stop
 

2000 camaro ss convertible LS1 6MT 95XXX miles. Stock other than SLP cat back SLP thermostat and K&N filter.
This literally just happen on my lunch break. Car was driving perfectly fine, then came to a stop light. Was stopped in neutral for about 20 seconds then the rpms just dropped to about 500 and car began to shake slightly. I gave it a little gas and it sputtered. Took off from light and it ran really rough sputtering and hesitating. I rolled down the window to park and could hear some knocking. I have since turned it off and left it sit for about 45 minutes.
Anyone have and insight on what may be wrong with it. I do not really want to drive her home from work for fear that I may cause more damage?, because I am unsure on how serious it is.
Please, any help is greatly appreiciated.

Check engine lamp lit?

Well after work I was able to take a look under the hood with my buddy and we quickly discovered that the #3 plug wire had come off... Pushed her back on and she runs like a top again. Still shows CEL, I will get that scanned tomorrow.