First off thanks for reading this and offering to help, it's a little long but I tried to be detailed
My 82 22r that has a Weber 32/36 dgv & Davis HEI dizzy developed an intermittent issue. First some background on when how it happened. I was driving down a rough trail the other day mid day it was around 100 degrees outside. Truck was running normal temp & purring along when I hit a hole pretty hard. Once I crawled out of the hole the truck wouldn't idle and had a slight stumble/popping sound at low throttle. If I give it gas it smooths out and runs strong and smooth with an occasional slight popping, sputtering sound, not like a full on backfire. Going down the highway there is the slightest popping sound and that increases if I let off the fuel & most times it dies if I don't keep the rpms above 1000,1200
Drove it home and parked it & the next day it started up and ran perfect. Killed it and it sat all that day.
Next morning started and ran fine sitting in my driveway. Drove 1 mile to work and as I pulled up to the job it started again, after work drove the truck home and pulled off the carb & tore it apart and cleaned everything that would come out or apart honestly it was spotless inside & out. Adjusted the float level that was slightly off, replaced the fuel filters, verified fuel pressure @ 2lbs coming into the carb, double checked the lean best idle setting, replaced the spark plugs, rotor & module. Have a cap coming with new wires. It has a minor vacuum leak where the throttle shaft goes in but it's always had that for the last 2 years and it's no worse now than years ago. Exhaust is in good shape no smashed pipe, carb adapter isn't cracked and no leaks there. Checked the vaccum advance line it's fine, brake booster hose is good
Once the Carb was back on it fired up & ran perfect for the next 4-5 hours then the same issue came back so I pulled the top looked it over, gave it some Carb cleaner out of desperation. Put it back together and it ran perfect. Next morning it was running rough again. Now it's a crap shoot if it'll run perfect or sputter & die at idle no matter if ii start it 10 times in a row. Engine temp has no bearing on the issue it's the same hot or cold,Checked the exhaust to see if it had any sucking with a dollar bill & there's none at all. I have an aluminum 10 gallon fuel tank in the bed & its clean & full with no vent issue.
Guys what am I overlooking or missing here? I'm at a loss as to what could be causing this to come & go