Mine would run really really rich until it warmed up and then ran fine. My fuel mileage went from "good" to worse. I found out that my AAP (auxilary acceleration pump, diaghram) had a hole in it. I replaced it and all was well till I started reving the motor and spraying carb spray to clean things up and now it idles like crud and dies. I'm letting it sit till it's cold again. I hoping it's just dirt in the idle circuit. If it is, I'll take it all apart, clean and rebuilt it. I've got the factory 83 manual if you need specific help on things. Let me know. Be glad to help.