[kda2000]

The symptoms you describe sound exactly like the accelerator pump not working -- and "feathering" the peddle to get it off idle proves the main jets and circuit work, and the fact it idles, shows that the idle feed works, and is adjust close to OK. The Accelerator pump gives a jolt of gas when you transition off idle, or want to accelerate under load, when extra gas is needed. The way you can tell if its working is to work the throttle linkage with the engine off, as you open the throttle with it off, you should hear and smell a squirt of gas, if so the accelerator pump is working, of no squirt of gas that is your problem. -- Ken