- Dec 21, 2013
- Auckland, New Zealand
- 1981 4 speed
Sorry, I don't have time to read the whole post but 15-16" vacuum at idle is too low for a mild or stock cam. If you have a quadrajet, then sunk floats or leaking well plugs come to mind but that should also cause sooty plugs. For vacuum leaks I like to use propane, with a small hose attached to the end of the bottle. With a small enough hose you can really pinpoint the leak, plus it is safe to use, easy to modulate how much to dispense, and propane is heavier than air and goes down not up. Any time you spray an area with a propellant you never know for sure if the residual just got sucked up and into the throttle opening or that there actually is a leak, plus most propellants are flammable.
Thats what i suspected. It is the original e4me quadrajet. Float level is fine, and still has fuel in the float bowl after sitting for over a week, plus plugs seem fine.
Have checked for vacuum leaks a few times and not found anything, but not using propane. I do have some so wouldn't be hard to try.