My roadrunner was stalling out, or would almost stall out every time I came to a stop today. at first if you tapped the gas it would pick up and when you let off idle fine. Then after a bit, it would just drop dead almost every time. I checked the float level and that was fine, any other ideas?

What kind of carburetor are we diagnosing from half a continent away?

It is a barry grant speed demon 850, mech. secondary on an edelbrock torker 383 intake.

any recent part changes or adjustments? Was it running good (not doing this) until recently?

It would not run at all for a while due to a few wiring problems. The ammeter was removed and the splice between those wires was done poorly, and the wire that fed the ammeter was spliced improperly and that was replaced. Other than that no real problems with it running. I haven't touched the carb at all, but it always idled great. Oh and new plugs (autolite 24) gapped at .035.

Only with warm engine?

Do you have hydaulical valve lifters?

Give it a try and reinsert the old spark-plugs.

yes it has hydraulic valves, and it was only doing it hot. Another thing I forgot to mention is that when I removed the previous spark plugs two or three of them were loose( only finger tight). I don't think the threads were damaged, as the new ones torqued down fine. I don't think I have all the original plugs.

Went out today and adjusted the timing. Could a loose coil+ cause this problem, or maybe the jets coming uncovered? The wierd thing is that it idles fine, and always restarts fine after this happens.

Screw each idle mixture screw in until it seats LIGHTLY (count # of turns), take them out, then shoot a 3 second blast of starting fluid into each of the 2 idle mix holes. Reinstall screws (dont swith them from side to side), the right # of turns & try it. Still stalling, turn each mix screw out richer (CCW) 1 turn which is alot to see if that circuit is the culprit. I'm assuming your idle speed is in the ballpark

The car seems to like to idle at 1000 rpm so thats where I have it. I think thats because of the torker intake, and the oversized carb but I'm not sure as I haven't run this combo before.

Have you taken the carb apart including metering blocks and checked it over?

Demons are known for QC issues, and I have experienced them on my own demon carb including way undersized secondary jets from spec on a brand new carb. If I were to buy another (I love the idle-eze feature) I'd never think of running one without opening it up.

I just tried pulling and cleaning the idle screws. No change to it running. Also the vacuum at idle is 10-14 in. and doesn't seem to be affected by the idle screws. Also can I use holley jets on the barry grant?

i just had a similar experience with an edlebrock carb. my truck idled great and had 19 inches of vacuum. as soon as i put it in gear or put on the brakes it would stall but start right up again. i replaced the carb with a known good one and it is fine now. i didn't tear into the other carb yet to see what could be doing it. it was only 6 months old.

if the idle speed is to low it would stall, but at 1000 rpm idle, I don't know that this is your trouble. If the float level is too high, you may be flooding when the fuel sloshes forward. I read recently that E-10 gas requires a slightly lower float level (I suppose because the ethanol expands easier than straight gas?)

Have you taken the carb apart including metering blocks and checked it over?

Demons are known for QC issues,

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....as well as the Edelbrocks and Holley Street Avenger carbs,.....Demons/Holleys seem to suffer from casting/machining debri right out of the box use, or after a few hours run time,...I've come across more than several on customers cars with brand new carbs,....the lack of responce from the idle screws, either one side or both,...disasemble and blow the metering block out with 100+ psi compressed air,...the amount of junk debri and casting crap is amazing!.....the Edelbrocks are best thrown in the trash

Demons suck...

Have had 3 of them in my family and everyone has ran way leaner than an equivalent Holley or quick fuel.

They look cool and have nice features but they just don't work. I would ditch it on Ebay or something and try something else.

look at the fuel level as soon as it stalls. My Demon 650 flooded constantly, even with a new needle seat. Turns out that when I installed any needle seat (2X) , the bowl would sheer off a sliver of the O-ring and that would lodge itself into the seat. I ended up sanding down a new O-ring and lubing it with ATF before I installed it. Seemed to work, but I rid myself of it shortly there after.....

could be the gas too. I've noticed my RR stalling out when my engine temp creep over 200. You can look at the ethanol in the gas boiling in my float sights. Or you could juts have a crappy carb, i had to get rid of eddy 800 because it would stall out every time i stopped but was great if it was cool and racing (which are two rarities for me)

What trans does the car have and if auto how much converter?

How much duration at .050 does the cam have and how much timing does the motor have in it at idle?

How much of the transfer slots is showing on the front vs the rear to get that 1000 idle rpm and is the idle-eze open ? If so how much?