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have you checked for any air locks in the fuel lines these can be caused when new parts are installed or fuel tank is ran dry. i had this problem on my golf and originally thought the cause was dirty fuel. i bought a bleeder pump that attached to the filter and bled the air out. priming if you like.
change the themostat when you remove the old themostat you should see it stuck in the open postion . before i install the new one i fill the the block with coolant install the new stat run the mtr and heater core until hot iwould also replace the cap
You may also have issues with your air flow meter.Generaly though this symptom is usualy a fuel pressure problem.This test may or may not work depending on wether the fuel rail is the problem or the pump.Squeeze the fuel return line at the back of the fuel rail and if engine improves the fuel pressure regulator on the fuel rail may be faulty.If no improvement its likely the pump.The best and most accurate test would be to use an inline fuel pressure tester.Can you hear the pump pumping up to pressure when you turn the ignition on?Usualy though the pumps fail but can be heard running but unable to maintain pressure.