Most of the problems of this type are due to air leaks somewhere between the throttle plate and the MAF sensor- it doesn't have to be much of a leak at all.

An easy way to find vacuum leaks is with carb cleaner. Selectively spray a spot - if the engine stumbles, you found a leak...

Or use a propane torch. Take off the burner on the end, put on a piece of vacuum hose. Now let propane out the end of the hose, hold it up to the joints in the air intake system. If rpms increase, you found a leak...

Both carb cleaner and propane are flammable, so be careful... the use of individual sparkplug coil paks on our boxes cuts way down on the dangers of high voltage sparks....

 

So it begins to learn in ten minutes what it forgot in 2 hours?
You have one of those slow-unlearning but fast-learning ECUs.
I disconnected my battery to make the final connection on foglights, and the car ran fine when I reconnected it. But the ECU had only forgotten everything for a few minutes, so it did take long to relearn it.

 

friggen ECUs... everything made more sense with no brains and just carburators.