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1990 964 C2 engine miss under 4000rpm

Engine

Vehicle Information: Model: 911 c/2; Year: 1990; Body Type: Targa; Total Mileage: 66000;

Starts, idles and runs fine when not doing spirited driving, but who can drive a Porsche without some spirited driving. At around 3000 rpm mashing the gas it will stutter until it reaches around 4000 and then rocket. 4000 and up seems fine. Feels similar to broken dist. belt with lurching on acceleration, been there, but only does it when nailed between 3000 and 4000.Has set in the garage for periods of time but driven well at least monthly. Seems to be a little more prevelant in very hot weather.Have checked the belt and it is ok. Any ideas besides the hammer?Than you for your help.

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