This doesn't happen quite often but every once in a while my car experiences a momentary fuel cut. This usually happens when driving on a freeway on the 5th gear and RPMs < 4000. Sometimes happens on lower gears too but again not at WOT.

It's a single turbo with a standalone ECU (FuelTech) on stock injectors and pump.
Might this happen because of a bad tune? Or I should look for the cause somewhere else...
Thanks!

 

You may have a clogged injector/fuel filter but more importantly... you're on stock injectors with a single turbo... CHANGE IT OUT!

 

Thanks! Injectors are something I should pay more attention to. Fuel filter has been replaced recently. On the side note my secondaries go beyond 90% duty cycle on higher RPMs perhaps a good time to have them upgraded. This would require a new tune, right?

 

yes, that's correct. Go with a nice aftermarket rail and Injector Dynamics.

 

A Bosch 044 pump would go nicely with the new injectors too That seems pretty dangerous that you're running so high on the duty cycle. I wouldn't risk running lean at WOT

 

Thanks guys for your hints and advice. Curious enough, I've changed my duty cycle alarm from 90% to 95% - soon I'll see if I hit it.