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1991 964 C2 Engine dies when off throttle

Engine

Vehicle Information: Year: 1991; Body Type: Targa; Total Mileage: 112000;

My engine will quit upon a long deceleration or down hill run when my foot is off the throttle. It will pick up again after a bit when I accelerate or pump the throttle. Other than this it runs fine all through the ranges and at idle. I am thinking it is a fuel problem because the tach doesn't kick off as though it isn't receiving a signal. The fuel filter was replaced about three thousand miles ago when it received a 60,000 mile service, I recently swapped in a new DME relay with no effect. I had it in the shop today where they hooked it up to a Hammer and received no codes. They have two other cars in the shop with the same problem and haven't figured it out yet.

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