This forum has very little traffic. You will have more responses if you post your questions and concerns on rx7club.com or rotarycarclub.com. I do not have a 3rd gen. but a surging idle is most likely the tps sensor.
To address the question about carbon build up: Any car that has been sitting for 3 years needs the fuel system addressed (Gas Tank boiled and sealed, fuel filter change, and possibly even the injectors serviced) before starting it.
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