My 1991 Buick regal failed the smog check, issues was failed the Fuel Evaporative Controls Functional. How can I fix it and pass smog check?

https://www.google.com/search?q=2001+dodge+dakota+evap+system+diagram&rlz=1C1JZAP_enUS713US713&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj9ot3N3oHVAhUJJiYKHbXHA-IQsAQIUQ&biw=1845&bih=990#imgrc=ZhkDDWeWf0B8wM:

Your mechanic will know. Eva= evap system, usually a vacuum leak somewhere. Vacuum leaks will also affect idle.

See prior answer to multiple post.

Possibly you could tell us what parts you replaced ? , possibly you could tell us if the check engine light is on?. what are the codes when you read them out ? The computer does not tell you what part to replace,, but tells you what part of the system is failing.. you have to figure out which part is causing the problem.What state do you live in? By the way.. The DMV will not stop you from driving the car.. you would just have to pay the ticket if you are stopped and a ticket issued. Post a comment and give us these answers for more help..

start at the gas cap and trace all lines from one end to the other filling for not seeing (feeling) cracks, a break in the lines, there are multipule lines

Maybe not your answer, but it is related: Before going to have your car smogged, check your gas cap. Check the condition of the gasket, or o-ring, inside the gas cap. If is already drying out, full of cracks, get a new one. It will not pass the visual inspection. The smog technician, salesman, will try to sell you a new one for $15 when you could get it for $8 at your local auto-parts store. The technician will tell you that if you do not get it right there and then, he will have to fail your car on the visual test and you will have to comeback to have your car re-smogged again.
The cap might still be doing an OK job of sealing the tank, but it won't pass the Visual, especially if the tech wants to sell you a cap. You can tell if the cap is doing its job if you hear a hissing sound whenever you open the gas cap after running the engine fro a while. If it is not providing a good seal, then you might get a check engine light with a code about a failure in the evaporative system.
Just a little thing to check before you go and put yourself at the mercy of the smog tech.
For $15 you could get a locking gas cap, which might be a necessity now with gasoline prices being what they are, now.

try changing the ekg valve, its not expensive and check your plugs, clean if needed and replace your fuel filter inline

Send us the code number detected there.

replace the pvc valve and have the egr valve replace.make sure the vacuum hoses connect to egr valve and pvc replace.change air filter.all those things will cause high emission if not working properly.cause you to fail smog test.

CHECK AND CLEAN I.A.C SENSIOR