[urq] hesitation, bucking on takeoff

[urq]

... you could always put a pressure gauge on the control pressure to see if 
it was getting screwed up ... perhaps its been the things I've had to deal 
with, but my money would be on an intermittent OXS Freq Valve driver ... run 
a couple wires into the cab from the freq valve and see if the duty cycle is 
stuck at 100% ...

Steve B
San Jose, CA (USA)


> 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.