Hard to trouble shoot over the internet either way.

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Yep..... you gotta back that car up to the key board
and let me hear it.... LOL. A shop I use to work at
years ago(before cell phones)we did driveablity on
Mopars. Sitting around after work and having a couple
of beers we had a customer call and wanted us to
diagnoise the car over the phone(of course without
paying for our services).... we told him to back it
up the the phone so we could figure it out... he wasnt
real happy

Howdy
a lot of more knowledgeable people than me have chimed in, but I just went through a similar problem with my 408. It turned out that the vac. advance(now disconnected)had a lot to do with my problem, but another thing that helped a lot with dieseling on shutdown and getting the idle happy below 1000 rpm was opening the secondary blades a touch. This is on a 750 dp, which has not only a four corner idle but also the small screw on the bottom of the carb to open the secondary. The screw has just enough adjustment to do what I needed- maxed it out and it was easy to use the regular curb idle screw to get me where I needed.

If the carb you got is a 2 corner idle maybe I'm blowing smoke atcha? I dunno but good luck, and feel free to pm me, I'm probably struggling with all the same issues as you.

Kevin in Philly

Are you sure you used the correct baseplate gasket? I used the wrong baseplate gasket on a 800DP once and it acted as you describe?

You got a spacer under the carb? I have a plastic 4 hole spacer.Put it on upside down once so the passageways that allow the gas to dribble down from the idle circuit werent there.They were on the intake side.No idle.

OK, I've pulled off the primary bowl and metering block this morning. All passages are clear. I made sure to use the same style gaskets I took off. It only has a primary side idle circuit, would adjusting the rear blades a bit make any diff? I am not opposed to drilling the primary throttle plates, but did not want to do anything that was not needed. I hope to have some time this afternoon to swap it back on and try it again.

the vac should be checked at idle in gear to get a reading for the correct PV. what ever it is the PV should be 2 less. vac is 10 PV should 8.