bounce stall

[thirstycanadian]

I've been having an ongoing problem with my 85 1 ton (454, original Rochester).

Sometimes when I bounce the truck hard (bad railroad tracks, etc) it sputters and stalls out.  It does not happen everytime I hit a bad bump, but it never stalls otherwise.  I obviously try to keep things from getting too bumpy, but it happens.

It acts kind of like it has flooded, because it will usually start back up after having a few minutes to breath....but a lot of the time, once it starts again it won't hold an idle, but I can keep it running if I keep the RPMS up....which makes me think it might be a vacuum leak, even though if I don't hit a bump it idles fine.

Any ideas of what to look for?  Thanks

[VileZambonie]

Your float level is incorrect. Replace the needle and seat and adjust the float level and float drop. If you do a lot of offroading use a spring loaded neddle