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This is not likely a running/tune problem but due to the transplant changes....With the loss of the dual mass flywheel from The 3.6(going to a 915 or 901 hope not ) there simply is not enough inertia and mass to catch the idle when decelerating at low RPM, especially if the clutch is pushed in for a quick RPM drop down in the 2000 rpm range.
There are folks that car reprogram the ECUs , but hopefully your's is not the 96 ECU which has a one time writable chip that cannot be re programmed and have not been avail.(chips) for years .
You can PM me and I can share experiences we have had w solving this by using one Co. or another as cost varies widely, as did results. There are also other band aids to try which may help that we have had varying results with, like use the AC idle kick up (there may be a low and a High like on a 964) to bump the idle up 100-200 RPM, or whatever Porsche planned for that. It involves grounding a wire in the DME harness, which is likely not being used presently after your engine was transplanted.
They could also try and tune around it by adjusting the closed throttle timing as you decelerate, but few have the hardware and software to do this. Many folks have done this V Ram transplant so likely one Co. or another has figured it out refining their approach over time...
Kevin
GAS Motorsport
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Upland, CA
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