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Low spped shudder in 79 GMC Sierra 1500

  
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Low spped shudder in 79 GMC Sierra 1500

 
pbshaw99 pbshaw99
New User | Posts: 2 | Joined: 11/09
Posted: 11/04/09
07:03 PM

I just replaced the engine and exhaust in my 79 GMC Sierra 1500.  When starting from a stop, with light gas pedal, I get a shudder.  If I step on the gas harder, it goes away.  I replaced the distributor and rotor (HEI ignition).  Any ideas?  

 
pbshaw99 pbshaw99
New User | Posts: 2 | Joined: 11/09
Posted: 11/04/09
07:04 PM

BTW, it's a 350 with 4wd.  I also replaced the U-joints on the rear driveshaft.