CFG/AIR file editing results in problems

Hi im making an F-18 and almost everything is done except for the CFG/AIR files. However when i made them (using fs2002 editor) the airplane had unstable charicteristics in that after the most minute touch of the stick the airplane would continue too pull up and even increase its pull till the plane flips out of controll. i have even tryed to edit someone elses file (still using fs2002 editor) and if i change even a .00001 of any measurement in the file (such as wing area) the airplane would be totaly out of controll 
any help would be [glb]GREATLY APPRICIATED[/glb]
Thnx

any help would be [glb]GREATLY APPRICIATED[/glb]
Thnx