I have to admit that I didn’t check the throttle response. I was focusing on bleeding the system, no leaking from the engine and so on. I discover that the fuel distribution pipe to injectors was leaking. Maybe I put too much pressure into it when installing it back? It’s a copper pipe. Thinking of soldering it.
The GS is all original and not restored (yet) The engine needs new head gasket and overhaul. Have stored it in a barn. Will be another project another year