Thanks for the suggestions. I did fail to include the type of plane my ASP 80 is attached to. Right now it is on a profile plane called the Radical 330 40 - 46 size 2 stroke or 52 4 stroke. The Engine when i remove the glow plug always drop in RPMs by at leaset 200 - 300 rpms and in the air it has a tendency to lean in and out while airborne. any suggestions?