1st my 2002 monte carlo with 3.4 the low oil pressure light would come on at a complete stop replaced oil pressure switch ,hasnt came back on it hesitates around 40 -50 mph now i have cyclinder 3 misfire.changing coil packs and spark plugs and wires any other suggestions

 

Welcome the MC forum.
You didn't indicate the mileage? but fuel filters are a good thing to change as well as the Air filter.
Take it for another test drive and see what happens then.