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Re: 2.5 TBI mystery
Posted to Technical Discussion Forum on 1/10/2019

Update: according to GM E-prom: PROM AUXH is Available. quote: "I don't think it will change anything". "idle sped is set @ 1600 RPM @ -24 deg. in the PROM".

I will update if they can locate an optional lower RPM option. It seems this would confirm the custo... Login to read more.