stumble/stall at idle

[sactoC10]

OK, now that things are drying out around here in Sacramento I am finally getting a chance drive my new toy a bit more. I've worked out the major bugs and this is what I've noticed in the last few days of driving it.

My 71 LWB 350 wants to "almost" stall once it is warmed up, of the line. Like sitting at a stop light... when the light turns green and I touch the throttle, I really am not certain if it is going to stop or go. So what I got into the habit of doing last night was simply applying some gas while on the brake to make sure I didn't stall.

This truck came to me with the exhaust split, glass-packs, stock manifolds and stock carb. The only change I've made was to add an open air cleaner/filter.

So is this simply an idle adjust matter, or is there something else I ought to know/do? THANKS!

[JimKshortstep4x4]

It could be as simple as an idle adjustment. It sounds like your carb is lean in one of the idle jets. If adjustment does not work then one of the jets could be plugged. I have had success in clearing a plugged idle jet problem by removing the jet and blowing out with compressed air. If that does not work, then the carb will need to be dissembled and cleaned.

Jim

[bpmcgee]

Someone told me one time that this could be caused by a small vacuum leak -- are there any vacuum ports unplugged? Could you have an old/cracked vacuum lines?

Brian

[sactoC10]

Cool, I'll check out both of these things after work!

[Gordo]

I would check your carb accelerator pump operation. If it's not doing it's job it will cause your stumble also. With engine off, remove air cleaner, climb in there with a flashlight and look down in the primaries while operating the throttle from idle position to wide open, you should see a nice squirt of gas enter in each barrel, if not you have found your problem.

[sactoC10]

thanks Gordo