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    Code p0089,P0091 Nasty HPFP Noise

    Has Anyone had this issue before my hpfp is making this horrible noise and im having code P0089 "Fuel pressure regulator 1 performance" -Auto Tech internals -Hpfp Act Press wont go above 200-300 on idle. -Ive replaced the pump with another oem one same noise and stuttering going on. Mod list...
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