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Erratic gauges and hesitation

Engine

Vehicle Information: Model: Poreche 911 Carrera; Year: 1987; Body Type: Coupe; Engine (type, size, modifications): 3.2 APE chip, Magnacor Wires; Total Mileage: 142K;

At fall storage ran perfectly. Recently after re-start the gas gauge began to waver, and most prominently the tach needle would start to zero and then waver widely upon throttle lift only. Then came hesitation at 4500 rpm, then after driving over 4000 rpm there was major hesitation, then hesitation/bucking at any possible place in the rev range. Barely made it home from a 650 mile trip last night. Got the multimeter out and got a cold 12.6 reading from battery, 13.6 with some ranging from 13.2 - 14 at idle. It has a K3 alternator with 20K miles on it.

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