[bran3b]

Do you have a mechanical pump or electric? I have an Edelbrock mechanical and was having similar problems. The symptoms were similar to vaporlocking. My final resolution was to install an electric "helper" pump. The electric pump doesn't need to be anything special, just a plain 7 psi. pump.

As for the reason why it seemed to be worse going up hill, I never could figure that out. But once the engine was shut down, it would not start again for an hour or so.

After adding the electric pump last week the car ran fine for a mountain drive on Sunday.

Good luck,
Bran