Yea I realize that is high (actually 15* advance I misspoke.) But it was running fine so i didn't adjust..."if it ain't broke." Anyway, I've got a previous post that discusses this with some additional comments from other members if you are interested. I will look for vac leak using carb...
Ok sorry for the delay...had to dig out vacuum gauge and find the time. At any rate, hooked it up to "gas filter" vacuum supply and reading 15 and steady. Idle seemed okay but didn't have tach on to see RPMs. Responded normally to throttle blip. Only thing I noticed was my vacuum gauge...
Recently been getting intermittent low and sometimes rough idle of my 81 40...barely stays running at times...runs fine with just a little choke. Otherwise runs great...egr disconnected and FCS direct wired. I've had some previous issues with carb I've been able to correct with carb cleaner...