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99 Taurus/Sable Intermittent No Start

DOHC Duratec engine. 166K miles. Occasionally dies immediately after starting. Then cranks vigorously but won’t start. Usually when warmed up. After waiting a few minutes, starts and runs normally. No engine codes. On one occasion, engine ran but missed and backfired and would not exceed 1000 rpm. Later started and ran fine.