Sent an email to the company who mapped the car, they have come back with this:
Martyn would very likely have some stored data on the car, although it may not have much bearing on the way it is right now.
Mapping is unequivocal, in that any settings are going to stay the way we left them in terms of relative output. I can only assume it was ok previously, or the man would have been back for another go!
Any mapping can only be long term successful if everything associated with the car’s management system remains in good order. The Alcatek has full closed loop idle control and should stay where it’s put.
A few examples of failures leading to idle problems;
Air leaks from gaskets or hoses
MAP sensor faults
Throttle pot faults
Lambda sensor faults
Idle valves sticking
Wiring issues
Leaking injectors or injector seals
Etc..
There have also been rare instances of track failures from the ECUs.
You have a couple of choices to deal with it, either bring to us or take it to another person to check it out. If anyone else wants to map the car they can do so, but they need to obtain the codes from Alcatek to allow it, then they have to set it up from scratch. (This isn’t our doing, incidentally)