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If it won't start "Period" when it is cold , I would look at the cold start injector, wiring and thermal cutout switch. I usually check the injector first by unplugging it and routing a hot wire and ground from the battery to the injector. Ground one terminal on the injector and "touch" the other terminal with the hot wire. The relay should click. If it doesn't, replace the injector.
If it does, connect a test light across the wiring harness connection and try to crank the car. If the light shows current flow, then the problem is not with the cold start injector circuit. If it doesn't, you either have a bad thermal switch or a bad wiring connection. The thermal switch limits the amount of time that the injector can fire (about 5 seconds). This prevents flooding the engine with gasoline. If it goes bad the injector will not work at all.
If it is only hard to start when cold, I would check for residual gas pressure when the engine has been shut off for a few hours. There is a spring loaded gas accumulator mounted beside the fuel pump that maintains a standing gas pressure on the injection system. This allows the fuel pump to pressurize the system rapidly during starting. If this pressure leaks down during shutdown, it causes hard starting. If the leak is slow, the car will start fine after the first start, and any following starts until you let it sit for a while and the gas pressure leaks down. Possible sources for the leak includes the cold start injector, any of the (4) fuel injectors, the check valve at the fuel pump discharge or the fuel distributor. The leak will be into the tank return line and is not visible.
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