Vw t25 stalls after 5 mins

[Jimwileman]

HI everyone, I’ve gathered some really useful advice from the forum over the last few years, and hope you may be able help with an issue I’m having.
We have a 1981 t25 microbus 2.0 air cooled, twin carbs. For the last 12 months it has started fine, but after about 3 minutes it will stall. It then struggles to start for a while, but will then run fine. I’ve replaced the coil, leads, rotor arm, plugs, module, and can’t find any air leaks. There is a slight smell of fuel. 
Any help would be appreciated?
Could it be a choke issue?
Thanks, Jim

[tobydog]

I'd strip the carbs down and clean them internally including all the jets.  Also change the fuel filter underneath and close to the fuel tank.  Check the rubber/flexible fuel lines.......

[davidoft1]

Check the chokes are operating properly and that the carb linkages are balanced