2002 Thunderbird Running Rough

Have a 2002 T-Bird with 13K miles. Have only had this for a month or so. Everything was fine until the other day I stopped at a Red Light. The engine started to run rough and it seamed the car was vibrating. The rest of the way home it was doing the same thing. Started it up next day and it was not so bad but still there. Any ideas???

Not many miles on that 2002. Most maintenance items need to be done on a regular bases and that might mean before the usual number of miles for that service. Do you have service records for the car?

Did any lights come on on the instrument panel?

I would suggest have it checked to see if the computer has stored any error codes. Even if the light is out, there may be codes and it is possible the prior owner has disabled the light to hide a problem. Some places will read them for FREE. Try Autozone or Advanced Auto Parts. Get the exact code (like P0123) not just their translation into English and post it back here.