I have taken pepper plants that were sick or covered in aphids and lifted them from there pots and shaken off all the dirt leaving the roots then sprayed off the roots with water or dunked it whole in the rain barrel and replanted the plant in fresh promix and it did not die .
looked just as good as the others in a couple of days.
but wait for some others to reply cause i am sure there are better ways .
also in my case i did not think that all of my 600 seeds would grow so i tried some weird stuff and planting a chili in sugar will kill it not make the pepper sweet.

Is it just one plant in a pot? If the plant is really being 'burned' by the fertilizer, I would suggest that the best thing to do is remove it from the fertilized soil and reduce any outside stress (like adding too much water, heat, etc). You could try something like removing the plant from the pot, repotting in something that drains really well and doesn't hold onto a lot of nutrients, like sand or sand mixed with vermiculite. Then you could flush it with water and let it drain really well. I'd place it in a shady spot, or in a humid spot, to reduce water stress, until it recovers. good luck!

thanks guys for the help

I would suggest leaching the pot with water several times so that water freely drains from the bottom.

Vera