I got the carb cleaned and put new gaskets thru out.New needle and seat,new float.Took a few times to get the float right but it seems good to go.Gas mileage back up to around 17 mpg,Happy...BUT,since I replace the gaskets and put back together I get a hissing noise from the carb,it changes as the throttle is moved.It sounds like a vaccum leak but the car is running good,hooked up a vaccum gauge got plenty of vaccum.I started the car with the top bowl of the carb off,saw it on youtube,If I cover up the venturi area thats where the hissing is coming from.What do you think....