Is it my carb?

[Franchise_24]

When on a trip today with our club. Car ran great, but towards the end of the day when I would be in first or second gear and try to accelerate it would act like I lost power and sputter and backfire some. Once I got into third I was ok. I opened up the GAV some and it seemed to resolve it, but it happened again a few more times on the way home. Is this carb related? Does it just need cleaned up or do you have other suggestions?

Thanks,
Neal