I have a 750 plus for several years, and the UAT placed horizontal,
had the same problems. First of all I've NEVER placed a filter in the
lines. I filter my gas on the way from the filling tank to the plane,
(good filter),; secondly, when I had this problem, I called Carlos from
RTI, and he told me to dissconect the gas solenolid. Guess what,
problem fixed. Never used the solenoid again, and the turbine is
now more powerful than ever.

Hector