Woj

When I first got my AT-400 it would act the same as what you are experiencing. They said that my pipe size was not the correct dia so I had Tam make another one for me. Still the same, so I put it on the bench with no pipe involved. Still the same. Then messing with the throttle curve was suggested. I fly JR 10X and when programming the failsafe there is no way to have it drop to idle with a curve. So if a split-second failsafe condition occurs it's a FLAMEOUT! An engine that cannot withstand a brief failsafe condition is junk. I sent it back and they tweeked the ECU so that it won't do that any longer which is what makes it the sluggish P.O.S. that it is today. Problem solved!

regards,
Kim