My check engine light is on and now my car cranks drive but it cuts off at red l

Hey sir how are you doing? Ok 1st off start by checking your idle air control valve "i.a.c" The i.a.c. is usually the culprit but it could go even deeper than that. If it only turns off or starts to run bad after the car warms up then it would most likely be the ignition control module going out. Start by checking your i.a.c. and then your ignition coil