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Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
Sounds like a combination of two things.
The default in electronic throttle operation is idle, but in your case it is going WOT.
So with an intermittent wiring or tps fault, it should go to idle.
It should also log codes, depending on what management system you are running.
I would say if the tuner is at a loss, to start with a new system installation.
I can't offer any further advice, since this is a custom installation.
Do you need any further help?
I hope my advice has been of assistance to you.
Does the blower run a bypass valve for light to closed throttle?
Something for you and the blower manufacturer to consider.