Originally Posted by cjtamu

SMracer, thanks for the help.

Pinoy, I know there were problems with some of the first gen Extech heads and they were replacing. You might contact Chad and see what they say about yours.

Dishsoap, what someone said earlier is correct. Put your idle gap b/w 0.5 to 1mm and leave it alone while you tune. If you get the gap too big or too small then you can't get the LSN right. Once you have the tune right then you can make small adjustments to the idle gap. Your problem really sounds like either an engine that's lost pinch (if it has a few gallons through it) or a small air leak that's making the tune wander.