Im having issues with my ek, it cold starts just fine but once it warms up and try to take off it stalls out, in a very sluggish way. I have a fuel pressure regulator and it doesnt hold pressure. I have no idea where to start diagnosing any ideas on what this could be?

 

Pinch the fuel return hose closed and see if the pressure comes back. If there is no change in pressure, then you either have a clogged fuel filter or the fuel pump is bad.