RE: Alpha 40 Trainer
We have been struggling with a few evolution engines at our club with the very same problem: they quit on us when advancing the throttle from idle.
This is a problem for new pilots deciding to abort their landing and go around for another approach.
After much tweaking and fiddling we found that all had overly rich idle settings even when set to the leanest the limiters will allow. We removed the limiters, leaned out the low end needles and voila! the engines ran perfectly.