I did a major tune up cuz car old. All parts are brand new, I replace fuel pump, fuel regulator, fuel filter, spark plugs and wires, distributor cap and rotor, head gasket, and both primary and secondary injectors, Now I have check engine light on showing 16 flashes. Car running fine and drove it for 10 minutes to see if check engine will turn off but didn't. Tried to reset by disconnecting negative battery for 1 to 2 minutes and reconnecting and still check engine still on pls help!