I had idling problems, thought it was a fuel issue, blew the carb with compressed air and readjusted low idle on carb to specs. Idles better on initial start, but then goes into SLOW mode, can not get RPM up. Checking thermostat, plugs, wires etc per the forum. Question, when I pump the primer bulb on the gas, I can see gas trickling out of the 3 carbs, the bulb does get hard, is this right?