why would my car be deiseling

 

Carb idled too high,
ignition too advanced,
plugs of a high heat range,
etc..

 

18 and 36 total in
low heat plugs
idle at 1000

 

wow no wonder

slow the idle down

why is yours 18 degrees initial ?

it needs to be wayyyyy lower, more like 8, in stock form anyways

unless its not stock cam and so forth ?

whats the specs ?

good luck

 

new 350 bored 40
10.1 to1 cr
trick flow heads
perfrom rpm intake
750 holley vac sec
msd wires
summit hei dist
.473 .486 zcam
rollar rockers
4.10 posi rear
350 turbo
shift kit
2200 stall
Heddman 1 5/8 shorty hedders
flowmasters
no its not stock by no means

 

Are you running your vacuum advance on full vacuum or ported? Full vacuum would give you a lot more timing at idle, ~30*, so that'd cause it.
Carbon buildup in the chambers can do it.
But yea, that's a fast idle speed. Not sure what the exact specs are on that cam, but with that much idle timing you should be able to back it back off. Pop off the carb and measure for a .040" vertical gap between the throttle blades, and the bottom of the idle fuel slot. ie. you should have about .040" of the slot showing. Adjust it until it is.
Then set it back on the car and start it up, adjust your timing to get about 800RPM idle speed in park, and readjust your idle mixture screws.
Drive it around for a bit. See if it diesels then.

What plugs are you using? What gap?

 

i fixed it by turning my timing up to around 32* at idle no vacuum hooked up

 

That's gibberish man.

Your problem is 2 fold, too high of an idle speed, having the butterfly's open too far, and too much timing at idle. Crank those down and you'll be golden.

 

idle 700 and turn timing down it starts deiseling again. so i turn timing back up it stops.