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  #11  
Old 08-09-2011, 06:39 PM
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I've had a similar problem in the past and it turned out to be the no. 7 & 8 spark plug wires being right next to one another. They should be as far apart as possible.
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  #12  
Old 08-09-2011, 11:25 PM
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Check for vacuum leaks.
The vac/adv in the dist is a likely culprit.

When my 65 did that it was my pre-warning that the
brake booster was about to go.
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  #13  
Old 08-10-2011, 02:46 AM
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Too much timing advance is my guess.

Back it off a few degrees and take the car out and see if you notice any change.
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  #14  
Old 08-10-2011, 04:31 AM
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Good advice in those postings. If carb has a lot of miles and was rebuilt. Depending on thoroughness of rebuilder, could be slop in primary throttle bar running through/across carb. Will change mixture ratio driving on primaries as raw air enters via throttle bar hole as bar moves within hole. When secondary opens the surging is reduced because of lower vacuum sucking raw air in plus any leakage is lower percentage of total air entering motor. Secondary had less use and seal was good. I was bitten by that one years ago.

Bill
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