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I have 1996 Astro that is having trouble starting. Once started it runs great. I have tested the fuel pressure and is above 60 psi before starting. I have replaced the fuel filter, plugs, temperature sensor/switch, oil and filter, and serpentine belt. What would cause difficulty in starting and then runs great after. Vehicle starts immediately after running up to two to three hours later. Hard starts again after sitting or in the morning. I am thinking about switch ignition module next.