'86 150 dies at idle

[FarmallM]

This engine run a fine at all speeds above idle. It will idle fine for about 30 seconds, then it goes poof & dies. It starts right up again (with choke) & will idle if choke is activated for 3 seconds every 20 seconds or if the manual choke is is pulled out almost all the way. Idle speed is about 750 rpm. If carbs are removed & cleaned with spray it will idle ok for an outing or two. Fuel tank, fuel lines, engine filter, water filter have all been replaced. How can I resolve this? Thanks for any help.

 

[99yam40]

drain and clean out the tank, lines, bulb, screens/filters, pumps, and carbs properly.
anything hiding in them will end up where it should not be

 

[FarmallM]

Should I replace the lines between the fuel pump & the carbs? If so, is that line anything special or just regular fuel line? Where my fuel/water filter is mounted does not allow the longer Yamaha 10 micron filter to be used. Are there short filters that are also 10 micron? Does the screen filter before the fuel pump need to be replaced or just cleaned? Thanks for the help.