[Bing]

Sounds like you're running lean, very lean.
You are able to give throttle while testing in neutral gear, because it doesn't engage boost.

As soon as you drive, it will engage boost and most likely it starts to spool at 3000rpm. Meaning, you will probally blow your engine if you don't get it tuned.

What engine management are you using? Also, could you read out your CEL code or us?


Bing

 

[Bing]

Oh ok... I didn't read the blinking part.
I had the same problem and turned out to be that the cable bridge of the injector wasn't connected properly. Causing multiple misfire CEL codes and the car to drive like it was hitting the rev limiter.