Engine stalls on gas after cold start

[lithboy]

Hey everyone, my lovely '72 124BS with an aftermarket 2 barrel Weber carb has started being a little finicky. It starts (after turning it over several times after a few weeks of sitting idle) and idles just fine. But then giving it lots of gas when it's still cold makes it hesitate (and even stall). I can prevent a stall when it's slow by slowly advancing the gas peddle until it's revved high enough to engage the clutch and drive, but usually I just wait for the engine to warm up. It doesn't stall when the engine's warm. It used to not require a warm-up so something's new.

Any ideas on what to check?

[GeorgeT]

Check the "accelerator pump", when the throttle is opened more air is introduced and it needs a shot of fuel to keep going.