Actually a Datsun 620 4spd manual). Truck tugs when driving 0-55mph

1978 DATSUN 120Y
77 MILES
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KBJAGRUN
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Everything stock on truck. No pulling on steering. Thought it was a brake locking up issue but that seems to be ok. Drive-train misaligned? Feels like I am pulling a heavy trailer. Every three seconds there are 3-4 tugs while driving.
Jun 2, 2012 at 8:41 PM
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RASMATAZ
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You sure the clutch is not slipping-also check exhaust for restriction-

http://www.2carpros.com/articles/engine-hesitates
Jun 2, 2012 at 8:46 PM
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