[s5uewf]

I use tecGT - are you using the Wintec software? Version?
I may be able to give you some places to look at settings.
But, it makes no sense that the engine behaves differently in random fashion.
If it is not the environment changing (temp), and it is not fuel supply or voltage/ground changes, then it seems to point to sensors.

In my case, I have had issues with the TPS. If it is not actually going back to "zero" then other settings do not get activated and it messes up operation. Anyway, I may be able to give you some areas to look at after I understand what software you are using to manage the engine with.

Also recommend the online forum Electromotive has - has been somewhat helpful to me a few times...