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put new plugs,wires and egr valve in. map senser still good plenty of spark from the coil pack
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Fuel injector is stuck or low compression. Perform an injector drop test.
What is an injector drop test
disable the injector for each cylinder , one at a time , comparing the RPM 'drop' to the others.sounds like you should notice a difference in each cylinder Except #5. Was the plug you replaced from #5 fouled with oil or gas , or was it realy clean compared to the others? Compression test may also help rule out certain issues , as will a simple vacuum gauge observation. May want to consult a shop for diagnosis if you don't have the necessary tools. It'll be cheaper than lots of unnecessary parts. Good luck.