It could be a pressure problem, cut fuel line, fuel tank location, bad glow plug, or low end adjustment. Check all this out first. Usually it's one of these issues.

I had this problem several years ago when my FX 46 was new. Kept dead sticking on me after going to idle. After running rich 5 or 6 full tanks, I spent the time in my back yard adjusting the low end, and setting the high end right. Mines on a Lanier Twister swinging a 12.25*3.75 APC. 11*6 should work well on this engine.

My factory setting was a little rich on the low end. If memory serves me correctly I moved it lean about 1/2 turn total or something like that. Make sure when adjusting the low end you do it about 1/8 turn at a time until you transition properly. To date, it's my best most reliable 40 sized engine that I own.

Doug