I have a 83 280zx N/A with a manual transmission. Recently this issue started and has been killing my gas mileage. The Z will run perfectly fine from a cold start all the way up to operating temperature. Once i shut the Z off and go back to start it after it has been off for any amount of time i get a misfire. Usually the misfire will disappear after running the car for 5 min after starting. While the car is missing i can smell gas. I have replaced the plugs, wires, cap, rotor, and fuel injectors within the last 15k miles. Any ideas? Thanks in advance

 

possibly chts