Posted by Janicholson on June 09, 2013 at 18:55:39 from (74.60.94.18):
In Reply to: enigne diagnosis posted by rosedale123 on June 09, 2013 at 18:23:45:
Timing at high idle must be advanced or it will do as indicated in your question. A timing light will help tell the story, it should be a little advanced from TDC when at slow idle, and probably beyond 25 degrees when running fast. The centrifugal advance is responsible for this change. Another way to see if it is timing related is to start it as it is, and move the timing when it is misbehaving in the advanced direction to see if it cleans up. If so it may be that the springs and weights in the base of the distributor (behind the points plate) are not advancing. Don't try to start it when it is artificially advanced as you could break the starter with kick back. Jim
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