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Idle surging up and down

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I have an 85 Scirocco 8v with 296,000 miles on it.  Yesterday it started =
idling kind of low so I suspected a vacuum leak right off the bat.  I =
used an entire can of carb cleaner looking for the problem and could not =
come up with anything.  Now the engine is going from "almost stall" to =
1100 rps - up and down.  It sounds like the vacuum booster is saving it, =
at the last second, from cutting off completely (I can hear it click =
just before it dies).  The car idles perfect if I turn the A/C on and =
the compressor is running; like the A/C vacuum booster is keeping it =
idle.  I know it is not the boosters because I swapped it out from my =
parts car just to check.  Any ideas?

Thanks!
Andy Morris
jeepvolks@alaweb.com    =20

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<DIV><FONT face=3DArial size=3D2>I have an 85 Scirocco 8v with 296,000 =
miles on=20
it.&nbsp; Yesterday it started idling kind of low so I suspected a =
vacuum leak=20
right off the bat.&nbsp; I used an entire can of carb cleaner looking =
for the=20
problem and could not come up with anything.&nbsp; Now the engine is =
going from=20
"almost stall" to 1100 rps - up and down.&nbsp; It sounds like the =
vacuum=20
booster is saving it,&nbsp;at the last second, from&nbsp;cutting off =
completely=20
(I can&nbsp;hear it click just before it dies).&nbsp; The&nbsp;car idles =
perfect=20
if I&nbsp;turn the A/C on and the compressor is running; like the A/C =
vacuum=20
booster is keeping it idle.&nbsp; I know it is not the boosters because=20
I&nbsp;swapped it out from my parts car just to check.&nbsp; Any=20
ideas?</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Thanks!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Andy Morris</FONT></DIV>
<DIV><FONT face=3DArial size=3D2><A=20
href=3D"mailto:jeepvolks@alaweb.com";>jeepvolks@alaweb.com</A>&nbsp;&nbsp;=
&nbsp;=20
</FONT>&nbsp;</DIV></BODY></HTML>

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