When exhilarating to clime a hill at 40to 50 mph the engine starts missing. on 2000 Buick Park Avenue

The problem occurs on every hill. Took Buick to several mechanics and got several different solutions. From computer problems to transmission/tork converter. But know one was really sure.

Asked by for the 2000 Buick Park Avenue
95% of the time it's the plug wires breaking down!! Scanner with misfire data and an ohm meter will find this problem!!!!
Thank you very much we will give that a try.