wildbour

Also it idles solid and the response is all there, but I will try and look around for leakes.

Opening the throttle by hand produces the same sticking feeling, and I am not seeing anything binding. It gets driven once or twice a month and it seems to have developed over time. Thanks for the input, I'm just stumped.

Yes. Both dashpot cylinders seem to be working correctly. I also just changed the oil in there to ATF; it's supposed to be 20W. Doesn't seem like the needles or jets are binding.

Any idea why SU carbs would have resistance right as it opens? It's fine once you're driving but starting from a stop there's pressure on the pedal and throttle valve to a point where it is very difficult to accelerate smoothly from a stop. It requires more pressure on the throttle than it should to get the engine to open up, but only from idle. So it causes the rpm to jump up to almost 2.5k when im trying to accelerate smooth. And it only happens when the car is running. There isn't any throttle resistance when the car is off. Its not the pedal itself sticking or the throttle cable.