timming

[slyfox]

Hi, I have a 383 4brl, rebuilt, with electronic control, 750cfm holley, 75 jets, timming ste at 12 , when sitting for a week, i have a hard time strating it, no chock on it, plan to put a manual one on, when warm or hot ,some times it backfires through the carb, not all the time ,on take off, on the highway speed it's fine, any idea what can cause this, thanks Sly

[mopar_nut_440_6]

Is this a new problem or ongoing? Did you change anything when this started happening? When you remove the air cleaner and manually pull teh throttle are you getting fuel pumping out of the squirters?

[slyfox]

Hi, It's ongoing, i changed the front jets from 70 to 75, it does squirt fuel, and it stop, ran good for about 3 weeks, but it started again, the starting part is the same, hard time to start it when cold, not when it's warm or hot, i did put the vacum advance back on the distobutor, that all. thanks

[slyfox]

hi again, it run nice on idol, but some time it runs rough, it only backfires on takeoff, no flames, just a loud POW,it does stall, but not all the time, 80 percent of the time it runs good, i have electronic ignition, could it be a small vaccum leak or the distbutor? 

[slyfox]

by the way it's an original 383 70 charger, with manifolds, but it rebuilt  thanks sly