You got that 100% backward. IF its blubbering, then it has excess fuel in there and it is too rich which is just as bad for the engine as too little fuel where it fades away and sags at full throttle due to being lean.

If too lean, they do not stall due to friction, they fade, sag or stall out due to loss of compresson because the sleeve expanded past the point where the piston expanded to.

Please try to refrain from spreading misinformation.