I've been running the engine and it seems as though I have the problem solved. I guess i'll have to take it out and fly it to see for sure. I tightened up the air-bleed screw a couple of turns. My engine is having some bad vibration problems when it's at idle. When I increase the throttle the vibration stops. How can I help this? I have the engine on an Aircore kit and if any of you have experience with those they have the engine, tank and all the other onboard gear on one long piece of would inside the fuse so i'm worried about the vibration damaging my radio gear.