Loss of Power/Stuttering Under Load

[alpiner]

So after I got the clutch hydraulics sorted out I took my SeriesV out for a test drive. For the first 15 minutes the car was running fairly well with a little hesitation when cruising. Suddenly the car started loosing power and began skipping with my foot on the gas. When I back off the gas it runs fine, but when the gas pedal is re-applied it looses power and skips. I limped the car back to my garage, kept the car in idle(running fine) and opened the hood and pushed the throttle linkage in and out experiencing good engine acceleration(obviously no load on the engine). I'm not sure if the issue is electrical or fuel related. Does anyone have any thoughts? P.S. timing checks out ok at idle and carbs have been overhauled, balanced, and adjusted.
Alpiner

 

[Series3Scott]

Its usually a silly little thing so I would first make sure the rotor is secure on the distributor shaft, all the plug wires are firmly in place, and the distributor cap is clamped down. If that doesn't fix anything move to fuel. Any black flakes of paint visible in the pump bowl? If you have an inline fuel filter when was the last time you replaced it?

 

[hartmandm]

In addition to the idle timing, you should verify the centrifugal and vacuum advance timing. The WSM details the process.

Once the engine fully cools down, does the problem remain when the engine is cold, or does the problem reappear only when fully warmed up again?

Mike

 

[RootesRacer]

Pump and fuel system capacity should not be overlookeed.

Also low dwell (excessive points gap if applicable) will cause misfire under load.

Too little points gap can cause weak spark at higher RPMs.

 

[Bill Blue]

Runs fine until warm up and under load? Classic capacitor/coil problem.

Bill

 

[sd_pace]

plug mis-fire under load

 

[RootesRooter]

Engine revs fine with no load, but no power under load?

Sounds like a hole in one of the Stromberg diaphragms.

 

[alpiner]

Thanks guys for the advise. I'll start the troubleshooting and report out findings. In the meantime I've ordered the Petronix Distributor Package from VB. I've always wanted to replace the old distributor, points, and capacitor.
Alpiner