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rough engine

  1. T

    '91 NSX Rough Engine up to 3500 RPM then smooth at higher RPM

    Anyone have an idea of what would cause my 91 NSX (39000 miles) to run rough, slight miss, up to 3500 RPM, but at higher RPM runs completely smooth? All coil packs and spark plugs were replaced a year ago, and it ran fine. Rough running just recently began. Happens when both cold and normal...
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