My 92 500E has loads of power on the highway,but intermittently bucks under heavy loads and when i try to stump it off line it falls on its face,whatever part you can think of is new.If somebody knows somthing please let me know.

Many possibilities!

Have you checked the basics? LIKE compression, ignition system including cap, rotors & wires?

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I am a mercedes benz technician and own a mercedes benz specialized shop.Any part ,you can imagine has been put in this car and every test you can think of is done and as i said when it is running normally it runs very strong,the problem is only from dead stop.I noticed yesterday,when i stopm on it from dead stop,it does not downshift to first,but if i am driving 4 miles an hour and do it it runs perfect,i have adjsted the bowden cable.what else do you think is wrong with trans?