Engine dies/runs rough/stumbles intermittenly

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Engine cranks no start,Hooked up fuel pressure gauge 50 to 60psi never drop while cranking it triggered fault code for crank sensor.replaced sensor engine started good but still have tyhe same problem Engine dies/runs rough/stumbles intermittenly.fuel pressure stayed at 50 to 60 psi when its happening.no fault code,no ck engine light happens only when vehicle stopped or in gear with brakes is applied and i can always duplicate this problem.need help