· Premium Member
Mine doesn't do it. Sounds like you have covered all your bases. I am thinking it is not vapor lock. The fuel delivery system is under pressure, not vacuum. I don't think your gas is boiling. Although you could double check and make sure your fuel lines are not running next to something hot. I'm thinking more along the lines of something with the primary ignition system. You may have an electrical connection that is marginal, something that is fine when cold, but when hot has enough increased resistance to cause a problem. You said you rebuilt the distributors, so I am sure you have new points/condensers. I think you will find it is a bad wire or connection somewhere.