why would yo want to plug it. the more air you can get in the better it is.
my snorkel is not hooked up to vacuum but i leave it there and my shaker flapper as well is not hooked to vacuum. i leave it wide open
1970 Mach 1 San Jose built Dec 23 1969. Marti says 1 of 7. Purchased in 1987. Original family owner of the powertrain 351C 2v FMX.
1993 GT 11,000 miles, Built 2-12-93 Auto, 3:27 Axle, cloth, sunroof. Untouched except for rubber and battery, Purchased new 8-3-93. still has the factory windshield fluid and new car smell.