help i am going nuts!!!

[flaccidracing]

my wife's 02 edge 3.0 v6 auto 115,000. ran great ,she got it smoged same day on the way home started missing ck engine light on. put new plugs and wires (original) and seemed to be better. now we have intermitnt miss at idle and up to 3000 rpm. replaced idle air control valve ...no help. today as it started to miss the check gauge light flashed...not the check engine. ran it on a scanner and nothing but a po316 code. help me

 

[Big Jim M]

Take it back to the smog place and see what they had to do to smog it.. Sounds like a vac leak. Did they take any vac loose?
Big JIm