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No, if anything the system gets gummed up.
Vacuum leaks cause rough idles however, so keep on that track. I drastically improved idle in my old 86 by replacing the intake gasket and the split, cracked hose from the AMM to the throttle body. Steadied right out. Both of those are likely places for you to start.
The gasket is like $4 and the hose cost me $14 @ www.fcpgroton.com.
Also, injector seals can give you leaks, so check into replacing those as well. And if you haven't already, by all means tune it up, and remove and clean the throttle body while it's apart. That gasket is less than $1.
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Rob Bareiss, New London CT ::: Roterande Fläkt Och Drivremmar!
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