Everyone is right. Also check for any pin-holes in the pressure or glow fuel line. I had a Goldberg 62 Skylane with a Evolution .46 in it.

I had a pin hole in the pressure line to my muffler. It was right near the nipple on the glow tank. The nipple was made of brass and it had a slight burr. After about a year of flying the vibration mad the tubing a little week at the nipple and I had a "Dead Stick."

It took me a while to find it... I looked for every other reason for the problem, before checking on my lines.