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There is no module to "reset" on the 3.2 motronic. Perhaps your mechanic was referring to the fuel quality switch? Sometimes people (incorrectly) adjust that to increase fuel and compensate for air leaks. But it's just a switch that you turn with a screwdriver on the back of the DME.
And there's many possibilities causing your rough idle, if you want to find it yourself you're just going to have to start checking things like searching for more air leaks and checking your fuel pressure, ignition, plugs, wires, base idle setting, base A/F ratio, injectors, etc...
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