B 12 engine cold car should be started with throttle.

Hello, your fault should be caused by too little fuel injection and too thin mixture. The reasons are as follows

① The air intake sensor signal is inaccurate!

② The water temperature sensor signal or oxygen sensor signal is inaccurate!

③ The gasoline pump pressure is too low!

④ The gasoline filter element is blocked and the fuel injector is blocked!

First, check whether the signals of air inlet sensor and water temperature sensor are normal. If not, check whether the pressure of the gasoline pump is normal and whether the gasoline filter element and nozzle are blocked! If you have any questions, I'll be happy to answer them. I hope I can help you. Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.