350 transmission question

[Dave K.]

Okay, so this isn't exactly a Chevy pickup question--actually a Jeepster but..... Ya'll have some great knowledge here so I thought id ask the question.

My brother has an all original 60s Jeepster with the V6 and 350 trans behind it. When driving it and it's cold the Jeep stalls when it stops at a light and when it's warmed up it stumbles and lurches almost like when you don't clutch a manual as you stop.

Any ideas out there? Could be applicable to our trucks I imagine! He's replaced the torque converter.

Thanks Dave