Greg,
Actually it is important to common up all the runners in a independent runner installation to generate as smooth a presuure signal as possible especially if a big cam is intalled, otherwise the MAP sensor will see the opening/closing of just the 1 clyinder and cause erratic idle.
This condition is identical to having an over 270@0.050" cam installed. At some point the MAP signal becomes unusable due to fluctuating manifold pressure.
