I have started testing my Rhino in recently finished SM Hawk. It has run flawless on test stand. Now I have found it wants to produce flame coming out of tailpipe after 3 successive full to idle fast throttle slams (sometimes only 2 slams). Engine shut down once. Looking at engine exhaust nozzle, I see a "rich" exhaust (slight flame) during first slam and richer still for second. Going from idle to full is good. I have restricted full throttle to 108K rpm for use in this plane. Following are ECU numbers: Acceleration delay - 020, decelaration delay - 008, stability delay - 050, still at factory settings. I have slightly longer fuel line from pump/solenoid to engine from test stand setup, this may be it. If so, any ideas as to what to change in ECU to fix this? If this isn't it, any ideas?
Thanks