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All the posts above make a lot of sense ,and should help. This may come from
driving lots hot rods, try patting the gas petal lightly once to clear it out, wait
for it to idle back down and shut it off! Also like already said better grade of
fuel!
May try de-carbon the combustion chamber with a drink of water. It's done by bring the rpm up while you pour water down the carb. Normally 12-16 oz is enough.
Do you always go to the same gas station? Have problems at some and not others?
I know my 67 is picky on who's fuel I use. Even some of the top names cause mine to diesel a bit at times. I fixed my idle speed a while back and that helped a whole lot. I try to stick to one gas station which never gives me problems.
Much like people who get old our trucks can get very picky and grumpy when they have something they don't like. It would kill me to upgrade in fuel because of the cost. 10 miles per gallon is bad enough with regular unleaded prices.
I haven't gone to the same gas station consistently. Then again, I haven't had her all that long to pay close enough attention to that. I'll try and remain consistent though to see what happens.
An Opinion: I think brands of gas made a difference a few years ago, but I believe today that all gas is most alike with the additives that are required to be put in. I run the cheapest gas that i can find and really don't see any differences.
My 2 cents will be on timing or idle first before brand of gas, causing dieseling. That was the issue that caused my van to diesel a few years back.
I bought gas at a Shell station about a month ago and had a slight dieseling problem. I also use the cheapest gas station in town and never have a problem. Perhaps my motor is extra picky but mine just doesn't like certain tanks of gas.
Keep in mind the gas stations should be changing from (winter) blend= crap,
back to (summer) blend= little better gas! At least that is what they claim!