I heard somewhere that if you hold the saw by the cord and it drops easily on its own the compression is bad. Would this always be true? I have an stihl 029 I recently accuired for cheap that I can't get to run properly. With the plug out and a finger over the hole you can feel good pressure but when I do the cord test it drops pretty easily. I have had the carb apart half a dozen times to no avail, anyone have any ideas? Should I buy a new carb or dig into the motor deeper?