4400 is stock for a gsr and that is also where the mugeb pr3 program puts it. Not saying that is very good but on stock b16a1 cams it isn' that bad. A code 73 on a pr3 ecu would tend to lead me to believe the ecu is fucking up since that code does not exist in obd0. The same thing happened to me a long time ago when a chipped pr3 started to go bad. Try a stock ecu or just a different one.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.