<VV> engine vacuum problem

Joe Dunlap taruffi57 at aol.com
Tue Feb 13 14:48:06 EST 2018

My semi-retired GM master mech. neighbor has a '65 110, Pg,vert in his shop-which, has vacuum readings jumping back & forth from high to low at idle.  He is stumped.  I think he has done all normal tune-up procedures.  Any ideas appreciated.

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