Bulb doesn't remain firm! Arrow on bulb pointing to engine. Maybe the check valve in this NEW bulb is not working! I'll buy another and try that. Could this account for the stalling. I'll describe it more. If I slow down to just above idle and then try to accelerate, it will occasionally die. Today when this happened, I squeezed the bulb and at first there was no pressure.

So tomorrow night, I'll clean the carbs and change the bulb.