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911SC engine problem

Engine

Vehicle Information: Year: 1983; Body Type: Cabriolet;

This is a euro moodel, with new plugs, plug wires, distributer rotor and cap,MSD igniition,just added SSI exhaust and M&K muffler.83000 miles. Starts great, accelerates good but stumbles at 2300 to 2600 rpm. Have checked timing, most of the vacuum lines, and adjusted mixture but still get the problem in that rpm range. Engine leaks no oil and no smoke.Thanks for your help.

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