Vacuum leak symptoms and cruise control engagement

[Bandit5.4]

If i had a vacuum leak, would not the boost gauge read 0 in. Hg at idle? It reads 20 in. Hg now, but Idle seems rough and I'm trying to rule out vac leaks or IAC, which i have not tested yet.

Also, the cruise control seems to be delayed in engaging, like it takes 2-3 full seconds or more before it takes over, which can cause the car to surge back and then has to take a second to find equilibrium at the commanded speed. Could this be another symptom?

Gen 3 VMP TVS w/ GT500 tb, slot style 05+ Ford maf

 

[Bullitt1448]

If you truly have 20” of vacuum, you likely don’t have a vacuum leak

 

[01yellercobra]

How much slack is in the cruise control cable?

 

[Bullitt1448]

How much slack is in the cruise control cable?

Mine is in a tote in the garage right now and I don’t remember what it was like when I took it apart, sorry

 

[01yellercobra]

There was a problem with the older Accufabs and the cruise control. The spot where the cable connected was in the wrong spot. It had to do with the throttle being designed for the GT. But if you popped off the cruise control cable it would sit about an inch away from where it connected to the TB. It caused the same symptoms you're talking about as far as taking a bit to catch and then surging for a bit. The fix was to insert a spacer that moves the arm out into the proper position. It also helps with the throttle pedal feel. But it's something to look at.