2 thoughts: Carb linkage/idle screw on linkage not adjusted right or maybe Vac. leak? Try disconnecting all Vac. lines & plugging w/ a screw etc. & see what happens.
Have had this happen before, but will have to think longer to remember the cause in my case.
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"If you do everything you'll win"
-LBJ
13 Smiles per Gallon:
66 Bonneville wagon
66 Bonneville 2d HT - In perpetual progress
2005 GMC L-33
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