you could install an MSD box. that will help with the unburnt fuel problem

 

for the evap make sure the gas cap is good and and the rubber grommet where the filler neck goes into the tank. and retard the timing to 10 if you have it bumped up

 

you might need new cats. thats always been an issue with my 86. i have to replace them every other smog year (4yrs). bad plug wires will give you a rich condition. if the gas cap failed they would have tried to sell you a new cap. thats about the only thing a test only station will do. make sure they heat the cats up really good before testing.

 

Hey guys its me again! Well i finally got to take my car to a shop and the told me that asfar as the car running a crappy, its the 02 sensor. They wanted to charge me $230.00 for the job>. WOW..., not today, i called the zone 4 auto and they got the pair for $90. I will install them later today after work, and ill get back to you guys to let you know if it really was the problem!

 

Good luck.
Some what had the same problem 5 yrs ago with high HC found out my cats were bad.

 

Well when i got to the shop it was too late.., they had closed. Im getting out early off of work today to go pick up the stang. I hope my cats are still good! I dont think they are bad because even before i put on the stock h-pipe the pony had a bad idle with the off-road h-pipe/? IDK well see. I have a question and it might be a little stupid but here it goes! If a shop does a diagnoses and you take your car home, go ahead and replace the parts they diagnosed where bad and the car still runs the same as before can i go back to the shop and ask for my money back of course showing them reciepts and everything you did?

 

Runs codes, make sure you back at factory designated timing, run injector cleaner through your fuel system and post your actual smog numbers...

I failed twice, I am in Cali and i later passed after running fuel injector cleaner, with timing back at 10*. Not saying it will fix your problem but its a start.

 

gg grandfather clause ftw. Washington state doesn't mandate emissions for anything older than 20 yrs either!

'66 ftw.