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Decel fuel cut (injectors completely off) happens under some closed throttle conditions. What conditions depends on PCM programming. Typically, coolant must be above a certain temp (engine mostly warmed up), IAT above a certain value (often doesnt enter decel fuel cut for VERY cold IAT), and RPM above a certain value (very roughly 2000 RPM in many cases). As RPM drops during a coast down, decel fuel cut stops at a given RPM value, like maybe 1500 RPM or so, and injectors turn back on.
 
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