Starts with very high idle, placed in gear it travels without accelerator at speed close to 40mpg, and it stalls while driving at intermediate speeds with a mark of HOT A.C. DISABLED. Is this the behavior of a bad EGR. If not what could it be please

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EGR and Throttle Position sensor were both replace about a year ago. But the computer went out and the owner ran the car for a bit with it sending to much fuel to motor and combustion was happening in the Exsaust Manifold. Computer was changed and now those problems exist. OH it also has hesitation and no get up when you punch the accelerator it just spudders.