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no power at 4000
1978 930. have all new vacuum lines and they are tight. Except for a faulty AAR the car runs great until it hits just over 4000 rpm. Then there is no power - even on boost. Feels like it is missing. I have adjusted the valves as well. Previous owner had bypassed the boost cut off switch but I have remedied that. Before I start with changing cap, rotor, fuel pump, fuel filter, accumulator, etc. I thought I would go to the well of all knowledge!! Any ideas on what is the logical progression to start on first??
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