My '85 Dodge 150 ram, 318 engine, torqueflite, hesitates/bogs/gasps when stepping on the accelerator, after reaching operating temperature (180 degree thermostat).

It feels like a worn out accelerator pump in it's 2 barrel holley carb...but is something else.

If you push down more on the gas pedal when the hesitation is starting, the engine will continue to run....otherwise the engine will die. It will restart immediately.

Only does this when the engine is warm; runs flawlessly when cold/warming up.

We've changed out the following:

carb, fuel filter, coil, spark plugs & wires, dist cap & rotor, ignition module, fuel pump, plugged the EGR vaccum line, plugged the vaccum line for the diaphram on the manifold heat riser, swapped out the rebuilt carb with a known good one.

As I said above, this bog/gasp/hesitation feels for all the world like a worn out accelerator pump.

The bog only happens when the truck is in motion, sitting at the curb I can gun/race the engine with no hesitation happening.

Wadduathunk? Your help/advice/opinions, please.