hey i bought a 83 280zx non turbo car they put a 81 turbo motor in . iv had it for about 4 month iv changed ecu,injectors and harnes,tps,coil,coolant temp sensor,fuel filter and cap ,rotor, wires ,plugs.still have problem when cold it takes a few times before starting when it does start low idle untill warms up.i dont have a cold start valve or air regulator. could that be the problem.