my guess it is yout fuel pump too
On my Autostart 750 the 1st pump locked up the replacement bought from Carlos was "tight" and it would not idle smooth +/-5,000 rpm until low RPM error-shutdown the turbine. The Pump Pulse Width was varing 50-55 and it should have been in the mid 70s. I am still waiting to get my pump back. Having to use a borrowed Jetcat pump!

befor sending it off to carlos...
check or replace fuel filters
inspect fuel lines for kinks or a pinch point.

can you get a pump from a friend to try ????

Bob