[quote=bartamos]Try it with gas cap off.
[/i]The cap is self venting, but I will give this a try[i]
It sounds like you have other issues,
But ill add this about the new vented gas caps.
Sometimes the new vented gas caps do not vent properly.
You'll know if its the gas cap, when you remove the gas cap after the truck starts bucking you'll hear air rush in at the filler neck.
When my truck started bucking after about 15 20 minutes it ended up being the new vented gas cap. The older N.O.S caps don't seem to have this issue
In my case I Modified the new cap.
_______________________________________
You mentioned the heat riser spring
Heres the spring position
...link......link......fig 3....________________________________________
I once had an issue of random flooding of the carb. Ended up being debris in the carb and at the fuel inlet port. I installed one of those inline filters at the carb.
...carb filter at beginning of video...Good luck on your troubleshooting
