'87 4kq running poorly

[Kent McLean]

Andrew Buc wrote:
> The car starts fine and idles fine very briefly, then the idle becomes
> slow and rough, but it does keep running. It doesn't run very well on
> light throttle--I have to really mash it to get going from a standstill.
> Under way, I often find myself using a lower gear and more revs than I
> normally would. The temporary slowdowns followed by abrupt speedups have
> continued.

Wild guess - bad 02 sensor.  When you first start the car, the 02 sensor 
is cold and is out of the picture. As it warms up, it gives bad signals 
to the ECU, causing richer/leaner conditions than would normally be 
called for.  You could unplug the sensor and see if that changes the 
behavior.

-- 
Kent McLean
1999 A4 Avant, V6 Tiptronic
1990 200 Avant mit V8 conversion
gone: too many to count, including my first, "Bad Puppy"