it's a manual pump and an edelbrock 1407. I checked the fuel volume and it pumps good, but I'll try what you suggested tomorrow. I was wondering the same thing actually which is why I bypassed the other tank/fuel switch completely (didn't help). My floats are set to offroad specs (7/16" above gasket). Accelerator pump is on the shortest throw.
would that problem still exist though if after it starts running rought it continues to do so at idle for severa minutes?