Help wanted adjusting engine slow running speed and any intake vacuum leaks

Thanks tennishoes, I've not counted but tennishoes must have solved a dozen things with my car over the last 2 years. 1) First the idea of a water/mist bottle sounds good Ill try that first. Then I find I can slow it down with the carb screws 2) Secondly Ill reset the timing to spot on 6 deg instead of7-8 ( although I understood a higher BTC was more efficient? 3) Excellent (hot idle speed info ill fix that) One other thing I noticed is that when I pull OFF a vacuum hose it doesn't change the speed much but I remember ears ago it used to allow the engine to speed up. Ill try these now ( its Thursday here in London) so should be able to inform tennishoes better. just one quick question in the description above what does ( V8-390 Auto. Trans. - TDC-0-10-20-30 Hot Idle Speed) mean,? Thanks again, notice everyone , this response from tennishoes must have taken a while to type out and research, , so thanks for that Neil Willis

Thanks tennishoes First Ive reset the timing at 6 deg as you said, it was about 8 as far as I could tell. That reduced the speed from640 to 580. So that's todays job done, Tomorrow Ill start on the carburettor, Ill screw IN then OUT to 2 1/2 turns each as you suggest and take it from there. The carburettor was new about a year ago but has only done about 25 miles since in the garage most of the time. Ill report tomorrow. thanks again tennishoes

Thanks again tennishoes. After the timing which lowered the idle speed to around 590 or so, Today I followed your instructions and screwed IN the mixture screws and OUT 2 turn then back IN about 1/2 to get it smooth Ive now got down to 510 or so, still a bit high to stop the transmission banging when I put it in gear. I could slow down the idle speed with reducing the timing but am reluctant to do that. I have now about19 deg vacuum and 510 speed I guess that's going to be that for now unless anyone can suggest yet another way of getting the idle speed down to around 470 as recommended. Thanks everyone.

Thanks tennishoes Ive even fitted a small spring on the accelerator arm to make sure its seated each time ( the speed screw is screwed well out of the way). , the dashpot is off, so one last question. then Ill let you get on with some better information. If the butterfly blades are actually fully closed, is it true that the engine wont run as there shouldn't be any air flowing to pick up the fuel?? If that is the case Ill not go as far as getting involved in jetting as I don't know enough about that but I could take the carb off and see if one /both of the blades are sticking just before closing and perhaps sand that bit Thanks again Neil Willis

Thanks tennishoes Following that comment Ill make a few additional fuel adjustments firs to make sure that that sides ok. Its kind of you to respond so many times I'm afraid I can only tick "Helpful" as the "best answer " ( you gave ) has already gone, Thanks again, Neil