My check engine light is not on but it flashes when i get around 60-70?

I recently changed my spark plugs, wires and coil packs.
1998 Ford Explorer V8 5.0 Eddie Bauer

You may need to check it to an expert professional or visit a automobile forum where you will get expert advice on this technical matter. Forums like edmunds.com & carforums.com

Could be the EGR valve isn't opening up, or a little misfire happening

The dealer of the car can read the stored fault code and then will know the *exact emissions part that needs to be cleaned or replaced.

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