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1986 Engine Miss

Engine

Vehicle Information: Year: 1986; Engine (size, modifications): 5.0 Liter; Total Mileage: 66900; Transmission type: Manual;

My 928S has developed a miss/surge between 2400 and 2900 RPM. I removed the aftermarket chips (Autothority), which were also causing missing at full throttle, and put back the stocks chips but still have the miss. Idle is good, does it cold or hot. Power seems a little weak due to this though once it hits 4000 rpm it really goes. Mechanic checked this problem last year and said it ran fine. Only mod is RMB.

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