Check the choke plate of your car engine to know the cause of the car engine problem. You should also check that the choke plate is located properly or not. You can check the choke plate is still working or not as it should. Does the choke plate open completely or not is also important question? If not, then you either change it or fix it. If the choke plate damage is rather severe, it is suggested to put down your repair tools and start looking around for a replacement choke plate to circumvent a repeat of this foul episode. The P2042 Code helps in this case.