Driving & then COUGH COUGH & Died..10 min later start & Fine..& Died again.

[msmaron]

Originally Posted by Bruce

Jumping in late, here, but I had the same problem. It seemed to happen most -- every time! --was usually first out and down the drive. Whooosh. He'd die.
I "fixed" the problem by giving the carb I'd rebuilt to a very talented hired guy who made it work like a champ. No more problem. No more sweaty friends.

What did it turn out to be was the actual problem?