I'm running a Holley 112-588 throttle body (4150 style) on a Holley manifold with a Gen3 GM ECU. Can anyone verify whether I should pull vacuum for my MAP sensor from one of the "full manifold" vacuum ports, or from the "timed spark" vacuum port on the front of the throttle body? I'm currently pulling it from a port in the manifold just below the throttle body, but it doesn't want to start properly (it sounds like a cough when it starts and sometimes cranks too long). Just trying to troubleshoot the problem. I have replaced the cam sensor with no improvement. Thank you!