91 100, Hesitation, stumble from idle

[SJ]

Patient is 91, 100, auto . . 5 cyl, no quattro, no turbo

Problem: hesitation and stumble when stepping on gas. Not obvious when done
slowly, but obvious when stepping on the gas quickly.

Car idles smoothly.

Once past that initial throttle point, the car runs fine, power is fine, no
hesitation at any speed.

I did a "tune up" on the car in December. Wires, Cap, Plugs, Distributor
cap, oxygen sensor. Techron in tank.

I checked the voltage at the oxygen sensor . . its doing its thing
swings back and forth between .3 and .9 volts.

I suspect dirty injectors. I'll put Techron in tank and run a couple of
tankfuls that way.

Any other ideas?


SJ
85 Dodge PU, D-250, 318, auto
85 Audi 4k - - sold but still on the road
88 Audi 5kq
90 Audi 100q