ORIGINAL: DavidAgar
If you are rebuilding after a crash, I would check all my fuel lines to make sure that you are not sucking any air bubbles into the engine. Air in the line will make your engine do just what yours is doing. Good Luck, Dave
Hi,
Like David said check all the lines and the clunk in the tank. Often after a prang, (heavy landing

) the clunk can get stuck at the front of the tank.
Cheers,
Colin