[From author of article linked below] The 88-3 conversion had been made on my plane. That was not what caused the first engine failure at FL230. Rather, it was a defective aneroid. The engine flooded when I reduced power. The second engine failure at 8,000 was the combined result of a mal-adjustment of the upper limit fuel setting and having gone to full rich when the first engine failed. "Everything full rich" on failure of one engine is what I was taught—throttle, props and mixture full forward, etc., with fuel pump from low to high on the failed engine if the earlier measures do not produce a restart. Leaning to attempt a restart is listed in the Cessna manual, but the manual does not elaborate on the reason for this last step, which I had not been taught at Flight Safety. The manual and Flight Safety both omit any detailed consideration of the point that the Continental engine can flood, particularly at altitude, if adjustments are off. Leaning to attempt a restart is the essential final step that Cessna pilots must keep in mind. I suggested to Flight Safety that they should add this to their syllabus, but sadly enough, they've discontinued Cessna 400 series training programs.
(Link to main article: http://www.godlap.com/Articles/Flying%2 ... rticle.pdf