It is stumbling only under hard acceleration and while driving

[Kern Dog]

Wow...I hope that you found the problem!
I'd suggest to change the oil before running the engine. All that fuel went either into the exhaust or past the rings and into the oil.  It surely diluted the oil enough to warrant replacing.

[XH29N0G]

Have you traced where the fuel is coming from?  and why? 

[johnnycharger]

Wow...I hope that you found the problem!
I'd suggest to change the oil before running the engine. All that fuel went either into the exhaust or past the rings and into the oil.  It surely diluted the oil enough to warrant replacing.

I am thinking it went out the exhaust. The dipstick doesn't smell like gas?

Have you traced where the fuel is coming from?  and why? 

No, it only did that the one time. Kind of odd.

[c00nhunterjoe]

That is either fuel boiling up or a sticking needle and seat. But if it did that for 5 minutes, i would lean to fuel boiling. Time for a blocked egr pan and coolcarb spacer.

[DanielRobert]

I agree with the above assessments....gotta think about fuel pressure that could be building up too.

[johnnycharger]

That is either fuel boiling up or a sticking needle and seat. But if it did that for 5 minutes, i would lean to fuel boiling. Time for a blocked egr pan and coolcarb spacer.

Thank you. I used to have one of those fenolic(?) Spacers on it but my air cleaner keeps hitting my hood pad. Maybe that kept it cooler before?

[johnnycharger]

https://youtu.be/JdUWCZKMebM

After driving it again today I can see the gas is still running into the carb after it is off. I think this means it is the needle and seat.

[XH29N0G]

Fuel is coming out through the boosters.  

I believe needle and seat would be for the float and happen while there was fuel pressure (fuel pump on) and would stop when shut off.  Boiling would expand the fuel and push it through from inside and continue after shut off.  My guess is that the diagnosis will be related to expanding/boiling.

See what the others say.

How high is the fuel set in the bowls?

[c00nhunterjoe]

You can double check the float level while its idling, but if it runs to that extent for 5 minutes after the car is shut off, its boiling.

[johnnycharger]

I have ordered the Cool Carb spacer. I will provide an update once I receive it.