[urq] hesitation, bucking on takeoff

[Ben Swann]

This problem has gotten progressively worse on my '83.  Earlier this summer 
she was running great with no problems except the occasional hard start. 
Now, particualarly after warm and mostly after shutting down and starting 
after 15 min. or so, the car bucks and hesitates like crazy on takoff, 
mostly in first gear, if I double clutch it enough to get som momentum going 
and shift into a higher gear it'll pull fine and then seems fine at higher 
speed or cruising.  It has gotten really annoying as often won't get out of 
its own way when taking off at a stoplight.

I know it is not the fuel pump cutting out.  O2 sensor has been replaced and 
attempt at adjusting the mixture make no difference.  The ignition 
components are new, incl. coil.

I suspect control pressure, as this happens after it is good and warm. 
Sometime is hard to start and stalls out after starting fine and then want 
stay running without giving the particular magic footwork to the throttle. 
I had recently cleaned airflow sensor and filter, and all was right and it 
ran good until it started doing this.

Really strange as it seems to have full power once going over about 7 MPH 
but off the line bucks like crazy.

Any ideas or BTDT.

Thanks,

Ben