K, then Tim is right... my ex-girlfriends saturn did that as well, but hers was a 4 banger. hptuner software will help you out a bit and removal of the limiter is a necessary step to going above the 4k range. This still doesnt answer my mysterious idle in my old 86... maybe cuz it ran mid 17's with exhaust/air work 
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2019 Toyota Tacoma TRD Pro ... M6, Voodoo Blue Fun Machine
1987 Pontiac Trans Am ... 305 TPI, T5, Project Car
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