ok so i was sitting at a redlight today and all of the sudden the car started to idle really rough and then it started like poping.so when i got home i went around the back and it seems to me like theres a cylinder loading up in the left bank.it only does it at idle when its in gear. like when i drive it it drives frine until u get to the redlight and in nutural or park it idles fine. did i just ahve a plug take a **** on me or soemthing?

 

I'm thinking maybe a vacume line came off or the PCV vavle is clouged or the hose came off,maybe the fuel filter is cloged,just check to see if any thing has fallen off or come un pluged.