I have a 1998 cobra thats starts and idles fine when cold and then shuts off at idle when gets a little hot. It will stay on if i keep my foot on the gas but when I let off on the gas it will turn off and turn on right away. There are no check engine lights. Have check Anyone have an idea what it might be. Ive recently changed coils, spark plug and wires, fuel pump and crank sensor. Have checked 5v as well.