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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Putting your hand over the throttle bore as to "choke" in a result of the engine being able to continue running means that either there is a lack of fuel and you are reducing the air to fuel to allow it to run or excess air to fuel and you are reducing the air to an amount that allows it to run. This means to first preform a leak down test and check for air leaks and if none are found and compression is good then you'll move on to checking excess fuel first and checking the injectors, make sure to check fuel pressure as well as part of the diagnosis.
Thank you!- Joe
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