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Message: <blockquote data-quote="jarance" data-source="post: 600882" data-attributes="member: 21">When the check valve is faulty, the fuel that is suppose to stay pressurized in the fuel rail leak back through the faulty check valve when the pump is stopped. When this happen, there is not enough fuel to feed the fuel injector during the first cranking. Starvation of fuel may caused misfiring in your case. Your problem seem to be OK when when the car is warm up. This is due to the fuel pump being force feeding the fuel rail and keeping it pressurized.try this test. Turn on your ignition but don not crank the engine. wait for about 1 minute and then crank the engine.this test is to allow the fuel pump to built up the pressure in the fuel rail and purge the fuel line of air via the fuel regulator return line.</blockquote>