Odd stumble only when turning left

Approach the bank from the opposite direction and turn right! 

Two things I would check: fuel pickup/strainer in the tank, and battery hold-down, cable ends, cables, etc., as you may have some battery movement on hard left turns.  This is one of those faults that can be very difficult to find, but very rewarding when you do.   

SWAG # 1.....   It might be a float level / needle valve problem on one carb....   I chased a fuel feed problem on the side of the deserted road, that turned out to be a needle valve assembly (Holley carb) had come loose and was dropping slowly into the float bowl there by cutting off fuel flow as the float tried to maintain its proper level....   Just a thought...

Does it happen when the tank is full or down a bit.  The Red Man used to do this on hard left turns when it was down about eight gallons.  The fuel would slosh to one side and would not pick up properly.  I  usually refill when it is down about that amount and then I don't have the problem. 

Hmmm...I've always noticed a stumble to the left when the Tullemore Dew was low in the tank!! 

Had an old Dodge once that used to do that. It was a sticky float causing it in just about the conditions you mention.

Float

right turns only....

here is a pic of my hotrod, just put 3 deuces on him....

Very nice, Vince!

Terry and David - Yeah, I wondered about that.  That's an easy thing to check and (hopefully) fix, so I'll look there first.

  I have also seen a lose wire on the coil or carb cause a  stumble .. But glad you found the cure in any case

I haven't yet.  No chance to work on it until this weekend.

Hope you get it figured out, Lane. While waiting for your report, I just had another flashback to that old '57 Dodge Mayfair my Father handed down to my older Brother who wrecked it and I adopted it. Way off topic here but maybe good for amusement. Back in the '60's the drinking age in Ontario, Canada was 21 but 40 minutes away in Up State NY it was 18. On a good summer Saturday night we'd get three or four carloads of guys heading down to Masena, NY direct to the Willow Grove. Live music, plenty of girls and they didn't check too hard for ID. Some of us were under 18 anyway. Ever since the old Dodge got wrecked, it had a bad habit of turning it's headlights off...just once about 30 minutes after they were lit. Very predictable though and we'd wait for it, even joking and taking bets when it would happen. And happen it would. I'd immediately turn on the right turn signal so as to see the side of the road and pull over safely. The cure was to get out, raise the hood and slam the bugger back down. On went the lights for the rest of the trip. Back home we tried many times to trace the problem but to no avail. Man...we could dance pretty good back then too. When the band took a break we'd go across the street to Tex Montana's Diamond Horseshoe and check out the action. Old Harleys everywhere too. That would have been in the late '60's. Sorry for off topic drivel...

Oh very on-topic in my book, David.  I'm sure I'll eventually find it, but it's not a major problem.  Our weather has finally turned nice, so I expect I'll be putting the miles on 'er.

Since we're drifting (and I'm king of the drifters), one of my high school buddies had a '63 Vw sedan.  Good car, but every so often when driving, the radio would just quit.  The only way he ever found to turn it back on was to turn on the headlights and the wipers at the same time.  That would do it.  Never knew why.

On my F250 pickup with climate control, every so often on start-up and un-repeatably, the climate control will go totally dead.  No lights, no blower, no nothing. Unexpectedly, I found that turning the automatic headlights from "Auto" to "Headlights On" and back to "Auto", just once, resets the climate control and everything is fine.  I also later read about this "cure" on an F250 forum, so it is more public knowledge.  No one knows why this works, and no one (that I've heard of) has been able to get it to repeat at a dealer to get the software fixed, so no "Tech Bulletin" yet.  It's been this way for 7 years....