I have a Honda HRR 2167vka which sat up for a year and the gas/ethanol did a number on the carb. I replaced the carb (wanted to have a spare to play with) and all is fine except the mower dies when I place the air filter on. It starts and runs fine with the air filter off but as soon as I put the air filter back on the mower sputters down and stalls. I haven't had opportunity to replace the air filter yet but wanted to ask if that doesn't fix the problem what would be next? Thanks