1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

engine shudder at rpm

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Old 12-29-04, 08:44 PM
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engine shudder at rpm

My 12a shutters/stumbles when I'm decelerating between 1000-2000 rpm in gear or out. It idles fine and pulls hard all the way up the tachometer from idle. What gives?
Old 12-30-04, 09:32 AM
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If it's a Stocker i.e. Rat's Nest still intact?
1st= Check your Coasting Valve
2nd= Check the Hose down by the Heat Exchanger. Due to the extreme heat in that area this Hose tends to go bad which will give you this type of sympton. Good Luck

sgieldon
steve
Old 12-30-04, 12:34 PM
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Motor mounts? U-joints? Check those. [Slim chance it will be those, but it never hurts to just look.]
Old 12-30-04, 06:03 PM
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Try adjusting your idle mixture just a little leaner.
(Shot in the dark.)
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