new carb wont idle

[hbstang]

bought a 3310-1 that was new,ran good for a year or so,but now wont idle,like a giant vacuum leak.i have looked over the carb and install and found nothing wrong.could it be somthing in the main body?

[Jim Comet]

If it has sat for a long period, I have seen gasket shrinkage cause issues. I would pull the bowls and blocks and look for anything obvious. Cheapest and easiest place to start along with fresh gas. Jim

[fryedaddy]

i run no ethanol gas in mine or the carb gets sticky and gums up with the 10 percent ethanol,never had a problem using good 93 no ethanol

[e philpott]

Maybe check that the intake manifold carb base covers/supports the PCV cavity completely and that the intake manifold matches that area for gasket support, I had a 3310-4 that had a bigger PCV cavity than what the intake manifold carb had and caused a vacuum leak after a couple days of running it because there was no gasket support in that area , ended up installing a 1/8th plate carb adapter from Edelbrock that supported the gasket at the carbs PCV cavity despite the mis pad match between the intake carb pad to carb PCV vacuum cavity