If the vacuum operated actuator on intake is bad, how much to replace? on 1998 Ford F-150

My 98' Ford F 150 4.2 was given newly rebuilt/shaved heads as one was cracked beyond saving.
In the process the Vacuum actuator located on the intake plenum was vatted while still attached to the intake itself and ruined (I’m pretty sure.) This has caused severe problems running the pickup to say the least.
First of all, how much to run a diagnoses on my ford?
Second, if we find the vacuum operated actuator is in need of replacement, how much to pull the intake and replace said part?
Third, how quick a turn around on repairs of this nature?
Thanks for your time and Consideration,

Asked by for the 1998 Ford F-150
What does this vacuum actuator operate?
The Flappers controlling intake to the heads
Inteke manifold runner or IMR. actuator, may be avail. aftermarket, check with NAPA.
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1 more answer , 1 more comment
are you talking about the idle air control valve?
The Big one at the back of the intake manifold