Re: Need help with engine idle?
I have the same distributor if it's the coil in cap version. Yes, the vacuum advance can is adjustable, you need a small allen wrench.
My motor would die out under 1,200 rpm or so when I installed a big cam and big runner heads, no velocity, and very little vacuum. I band aid fixed it for a while by running mechanical advance only, try that, if it idles steady, you have eliminated the carb problem.
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang