Something is weird about my FlightFX/SGa DC-9-51

Aloha All,I just got the new DC-9-51 srs from SGA, i must say....very impressive! I seriously thought someone was teasing with the Iron Knuckles DC-9.........anyhew.............Im not sure what the issue it. When I flew my DC-9 this morning......the Throttles were jumpy. anywhere from N1 24% to about 77%, it was jumpy. I push it up from idle to 45%, and it will rev. up and down to 38%, like the engine was out of tune. After 77%, it will sound normal.........Ok, did anyone follow that? Is it the air file............my sim?I thank all who respond!Aloha!