I have an FS 48 Surpass that I bought new (a long time ago). It has very little flying time on it and has been in storage for many years. I test ran it and it runs nicely on the ground. Today I flew it on a Sig Rascal and found that the engine will lean out during flight maneuvers and then run rich and then quit. Any ideas? If it is an easy fix, I can do the repairs myself, otherwise will it be cost effective to send it in for repair. Thanks!!