Never a good idea to piggy back on another persons thread Jim.
Boggs down & dies will be an engine &/or deck problem .
If it bog down when you engage the blades standing still, usually it will be caused by a deck problem like a bad bearing in the blade spindles , debris wrapped around a blade , frozen idler pulley or the like .
Otherwise it is an engine problem and is generally a bad governor or dirty carburettor .
The biggest load on the engine is running the blades .
Sit some one in the seat, engage the blades then manually move the governor arm to make the engine increase speed .
Do the same without the blade running.
Let us know what happens.
