94 F350 with a 5.8
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Connect a fuel pressure gauge to the test port on the fuel rail, turn the key on. When the pump primes, you should see about 40 psi. If that's good, try starting it with your foot down just a bit on the pedal. If it starts, you have a sticky or defective IAC valve. If that doesn't work, try flooring it. If it starts, it was flooded and you probably have leaky fuel injectors.