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You don't state make or model, if carby fuel system check accelerator pump and choke are working, if fuel injection check cold start injector is working. If diesel motor check glow plugs.
first you start with out accelerator .keep it running for a while .until warm up engine . check the out side temp. and keep clean always .
always start wit out accelerator .
probably your crank position sensor is bad. it determines the position of crank and adjust ignition timing. when timing is off it wont start.it cant catch. this is unrelated to outside temperature.
Does the engine temperature getting up to normal range? If the thermostat is removed, or stuck open the engine temperature sensor will not allow the transmission to go into overdrive since it thinks the car is too cold
Friend, you've changed everything but the right thing. The temperature sending unit. It tells the computer to go into cold start mode to start the engine by putting more fuel into the engine. If this sensor is erratic, sometimes don't work, it will cause a hard start situation if not in cold start mode. Dealer cant find this because it's a manual thing and may not be showing up on his tester.
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