Correct me if I am wrong, I am new at this as well. But I have found that I need to tune my engine on the ground then perform the nose to sky test and if that is running well then richen it just a tiny bit. This way it won't lean out to much in the air and cause it to stall. Also check your fuel tank and make sure it is secure. I had similar problems and believe the cause was due to a loose fuel tank. I tune mine by ear but double check with a tachometer just to make sure.