95 GT miss fire at idle

Im wondering if anyone knows what would cause my 95 GT to miss fire at idle. I just got this car a week ago monday and i love it except for that dang miss. Ive put Sea Foam and some other type of cleaner in the fuel because i supected carboned up valves from the previous owner leaving the car in the garage and starting it for 15 minutes and shutting it off and never driving it. It only has 68000 miles on it and a new set of MSD wires and plugs. Im going to put a new fuel filter on tommorw. The only reason im worrying about it is because its a stick and some of the lights around town are long. Thanks in advance.