1994 gtx shuts down at half throtle

[deeretrain]

on the lake today with my 1994 gtx,starts fine but when I would get to or before half throttle it would die out like I would have hit the kill switch.Any ideas what would be going wrong?
I changed fuel lines cleaned selector valve,cleaned out the fuel tank and cleaned carb filter in the forward carb+the main filter under the hood.It ran fine last season befor I did all the work over the winter.

Thanks in advance
Scott

 

[Dr Honda]

sounds like you may have an air leak in the fuel system, and can't draw fuel. I would check the O-ring in the fuel bowl.