Do you still have the throttle sensor hooked up? Have you checked the voltage? This sets the ign advance and you'll get flaky idles, hard starting and surges about 2500-3500 rpm. Between the Yellow and Black wire it should read 0.5-0.6volts, ign on, throttle closed.
I have none of the negatives with it unplugged from the harness. No surge, starting I think will be something I need to get a ritual for. I may need more throttle twists to prime it. Idle is dead flat and perfect response.