retarded air grabber

The Air Grabber on my 72 Roadrunner is a bit S L O W.

Actually, it is delayed. After hitting the switch, it takes a good 10 seconds before it starts to open. Actually opens reasonably fast once it makes up it's mine to do it. It flips shut quickly without the delay.

What gives? Everything is hooked up right. No obvious vacuum leaks. No hissing.

How many inches of vacuum do you have @ idle?

Just my $0.02...

Haven't checked vacuum, but very mild cam.

I've actually hit the switch while engine braking to boost the vacuum and it made no difference.

I'd start by pumping up the nipple on the servo itself w a mityvac/vac pump to narrow down if the prob is the servo or in the vac supply to it

Mine is sort of the same way. Then when you get over 40 mph it flutters.

does your vacume can hold vacume ??????

I think you could have chosen better wording for your thread .

Since it runs off vacuum to open you need to look at how much vac you have at idle, if it low because of cam choice I could see this happening .