The first thing to do would be to flash a standard map back in to see if the running issues disappear.
There may of been an underlying problem that the remap has un-covered i.e a dying MAF. The old ECU flash would of gradually self-learnt to a certain degree to compensate for the changing performance of the MAF. When reflashing the ECU defaults to 'un-learnt' settings and sometimes this causes running issues from there on.
The same would occur if you force and ECU reset on the standard ECU.
What year/model are we talking about ?
Unless the 'generic' map is very wrong i.e they have somehow flashed an image from a different variant in it should not cause running issues.
By different I mean an STi base map into a WRX or vice versa. I'm not even sure this is possible as it is something I have never tried through fear of bricking the ECU.
Even a map adjusted for much higher boost should not cause running issues at part throttle or idle because generally those values/areas do not get changed. It would only be an issue if the injectors are changed and require rescaling.
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