Car has trouble staying started after being driven, and sometimes shuts off when coming to a stop..?

it could be alot still but id put money on injectors spark plugs/wires/cap/rotor its ether a spark a fuel or a compression problem just for giggles i would put an air filter in there to just in case for some reason its not getting any air you can tell if you change the plugs it there black to much fuel not enough air white to much air no fuel and gray its running good air to fuel