I have a correct Holley teapot dual quad setup on my '57 T-Bird. Was running great with no problems (carbs rebuilt last year). Last week, after driving 40 miles, I stepped on the gas after sitting at idle at a traffic light. Then stumble & stall, twice. I assumed the cups on the accelerator pumps were bad & changed them (one was off the stem and they both were enlarged due to the ethanol content) & no change in performance. I then adjusted the dashpot screw with no change. I then adjusted the 4 idle screws & still no improvement. I finally upped the idle approx 100 rpm via the throttle stop screws & no more stall. Is that the correct fix? Does the engine idling at approx 650 rpm in Drive take me into the main metering system from the idle system?



Thanks

I am sure that dual teapots at 650 rpm idle are NOT in the main metering circuit.

John - "The Hoosier Hurricane"

Sounds like some dirty air bleeds.  On the top cover of the Teapot carbs, there are some very small air bleed holes that can get dirty.  Shoot some carb cleaner through those holes.  Also check that the machine screws holding the carburetor top cover in place are ‘snug’ as well as the center bolt that holds the air cleaner stud.  A worst case scenario is the top cover gasket no longer sealing the cover properly to the carb fuel bowl.

Lorena, Texas (South of Waco)

I’ll add that performing a ‘running flush’ on the carbs might also fix the problem. Here’s the link to the past thread explaining in more detail what a ‘running flush’ is.

http://forums.y-blocksforever.com/Topic51732-3-1.aspx

Lorena, Texas (South of Waco)

Thanks guys