I had the same problem. When I just got into nitro, my tank cracked where the screw goes in at the bottom. I was a moron and put CA glue
inside of the tank. Once I ran the truck, I found out that the alcohol melted the CA away and it blocked my carb up. I would suggest taking apart your whole carb and washing each and every piece carefully. Also, take a flashlight and look into the holes where the needles screw in for blockage. If that doesnt work then its definitely your engine but I think 100% that your carb is the culprit if you dont have a serious air leak anywhere else
[8D]