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Take to a nissan tech this sounds like a bad tps sensor throttle position sensor or a cruise control issue . Your problem is likely to serious to deal without a code reader an having the vehicle in front me. Think of safety first here or a accident.
disconnect the ecu for about an hour to reset these to the makers default setting, also sounds like the maff sensor has broken down, i.e computer tries to put to much fuel in and not enough air! have you also replace the fuel filter?
if you like the car, and the rest of its in excellent condition, then fix it.it its rusted under neath, paint bad, interior bad, then NO. try to find a low mileage newer engine. I dont know Nissan that well, but didnt the MAXIMA use thes same engine. if so, there a lot to choose from. a salvage yard should be able to tell you what engines will fit. I would get one from a MAXIMA if at all possible. older mature drivers, ect.