I have a Honda HT3813 with an engine issue. I went to start it up a couple of weeks ago and when I did, it ran like it was starving for air. Going through the routine, I changed the air filter, and plugs (which had a lot of carbon build up). I went to start it up again and the same problem was still there. So, I rebuilt the carb. I put the carb on before I hooked up the air intake and started it up. It ran like a champ. As soon as I connected the air intake the same problem was there. Can anyone lend some help with this?