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Re: Edelbrock 600cfm carb idle will not stay steady
Throttle shaft bushings wear in a front to back direction on the drivers side of the carburetor. This wear is accelerated by having improperly installed springs or too heavy of return spring. (Most aftermarket springs fall into this category).
You can feel the shaft wear if you try to move the throttle shaft forward and aft. Anything more than 1/16" of play could be problematic.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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