2000Burban

My 2000 Suburban is "stalling" while driving at highway speeds, have only noticed it 55mph and up. Sometimes it will pick itself up while coasting and I can continue to drive. Other times I coast to a stop and can start it right back up. Last summer I had this very same problem and changed the fuel pressure regulator and didn't have any issues up until this week, almost 1 year. When I changed the fuel pressure regulator it had been leaking. The new regulator does not seem to be leaking. I'm not getting any codes and it seems fine driving in town with similar drive times without problem. I've read probably 20 + similar problems on the net without an answer.

Thanks,
Mike