Will NOT run right!!!!!!!!!
Check the ballast resistor?
Ballast resistor bypassed.
Sorry, that was a different post.
Yes, replace it, they are cheap, and they can fail intermittantly because of temp variations.
Del brought up a good point to check (Valves)
Is this a hydraulic lifter system?
Other than adjustable valves being set to tight or a failing ballast, the problem sounds like fuel to me.
What pump are you running, and is it possible that fuel is getting past the needle and seat in the carb?
Overfilled bowls can cause an engine to die when the fuel moves to one side or the other.
Plugs wouldn't show it because it would only be momentary.
Does it do this turning right, left, or both?
Last but not least, is it getting worse or happening more often?
Lot of questions I know, but it matters.