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This engine is very sensitive to fuel pressure. The standing pressure must be 61 PSIG to start reliably, although some will start as low as 58 PSIG. The fuel pumps are also very sensitive to voltage. A one volt drop can result in fuel pressure that is 5-7 pounds lower. As a result, connections are very important, including grounds. If you can jump the battery to increase voltage while cranking and the vehicle starts reliably there may be a low voltage problem.
If the fuel pressure is adequate the problem may be with a failing coil or ICM.