'75 Chevy 3/4 ton 4x4 350 ignition?

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  #1  
Old 08-15-02, 12:56 PM
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'75 Chevy 3/4 ton 4x4 350 ignition?

1975 Chevy 3/4 ton 4x4 w/350. ~15,000 miles on rebuilt.

After truck is driven for 15-20 minutes the engine begins missing and sputtering when under load. The engine will idle fine. I replaced plugs and fuel pump to no avail.

Thanks
South
 
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  #2  
Old 08-15-02, 01:17 PM
Joe_F
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How's the ignition system? Cap and rotor? Wires? etc,etc?
 
  #3  
Old 08-15-02, 05:36 PM
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next time the problem occurs disconnect the vacum advance if it runs better you likely have a bad pickup coil in distributer, but could likely be bad plug wires or cap and rotor as joe said.
 
  #4  
Old 08-16-02, 02:15 AM
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Sounds like cap/rotor problem. Look for hairline crack in cap.
 
  #5  
Old 08-17-02, 08:11 AM
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I third the motion sounds like a bad wire to me.
 
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