Help with stalling

[Flyfisen]

73 with 351 swap. Motor running fine but after it’s warmed up it doesn’t want to idle in drive when stopped. Have to throw in neutral. Thought maybe torque converter? Trans shifts fine once moving, just another one of these agonizing problems. Filled it up the other day, oh shoot now the gasket at the sending unit on top of the tank is leaking. Dropping the tank again for another day, for now only fill 3/4.

 

[Flyfisen]

73 with 351 swap. Motor running fine but after it’s warmed up it doesn’t want to idle in drive when stopped. Have to throw in neutral. Thought maybe torque converter? Trans shifts fine once moving, just another one of these agonizing problems. Any ideas where to start looking.

 

[73azbronco]

EFI? Carb? Transwarp injectors?

 

[Flyfisen]

Edelbrock 650, new...C4 original fluids good.

 

[SteveL]

Fuel filter?

 

[Flyfisen]

New replaced when new carb installed. Engine runs great only loads up? And dies when stopped. If you shift into neutral while stopped no issues, acts like a manual and clutch not depressed when stopped.

 

[spap]

What’s your idle rpm when in neutral

 

[Flyfisen]

Well to start sorry this got posted twice by accident. Just to fill in blanks again it’s a carbureted 351W. New 650 cfm with replaced fuel filters.
Idle rpm around 700 in neutral.

 

[sprdv1]

got to check out each piece of the puzzle one at a time

 

[jckkys]

Idling in drive with an automatic puts a load on the engine requiring a richer mixture. Did you adjust your idle mixture with the transmission in drive as you need to? I think that would fix your problem. The AFB carb is the easiest of any for adjusting the idle speed and mixture. The Edelbrock performer series owner's manual neglects to mention the auto trans procedure, tho it's common knowledge. Otherwise the Edelbrock manual provides good tuning advice. Idling is the condition where the least fuel is needed, so it's the last place you would see the need for a new fuel filter. That happens when the engine is making horse power. Throwing new parts at an undiagnosed problem is a waste of money.