For those with cracked charge tube—–

What were your symptoms? I am trying to figure out if I might have a crack or not and dont have time to take off the tube–
Mine has been running amazing, but seems to now fall on itd fave whenever its warmed up– itll get goi g fine, but seems to fall on its face around 40 ish– for those of you with a cracked tube, what were your experiences?
Thanks!