sublimemike
Well-known user
Been a while since I posted. Thought I would throw this out for carb gurus. Carb is Holley 4296AAS an L88 carb on a big block. Lumpy roller cam. Been happening a while and Ive been trying to cure. Carb runs fine on any short trips but is unhappy when it reaches heat saturation ..ie after 20 miles plus and properly warmed up. Below 1000 revs she just drops completely out and dies - when I come up to lights, roundabout etc . I set the idle running revs about 800 rpm and this is all fine. I've tried richening the idle circuit up with the screws either side thinking it's maybe a bit lean . Started 1and half turns out and tried a 1/4 turn at a time , up to 2 and half turns and not making a difference. Car restarts but need to keep above 1000 revs. Thought about the secondary throttle stop screw? Just want to get some ideas before I maybe have to pull the carb off as this adjustement is done from underneath. I don't have a vac guage or AFM but can get access If I need be. Thanks all.