ka stumbles from 2-3k rpms when cold

[shanes14]

this only happens when it isnt up to operating temp. it stumbles and acts like the spartk plugs just dont want to fire. but it clears up after 3k and idles fine. i havent been able to find anything to fix it. its not timing, not a blown headgasket, no codes, new wires, plugs, cap, rotor, ignition coil, blah blah. could this be my iacv? i know iacv is known to making it idle crappy but i dont know what else it could be.

its on a 92 ka with new head/headgasket( it did it before i changed the head)

im out of ideas.

[jamanrr]

you know I had somehting similar to this happen to me and thought it was my o2 sensor. Turned out to be a bare wire and some crimped wires which were grounding out causing the sensor not to read right. The o2 sensor is basically useless till around 600 degrees F and that is when it kicks in and starts doing its thing.

[shanes14]

hmm. ill try that. i replaced it when i first got the car, but i put in som eheaders and beat it up prett ygood getting it in and out around the steering column. ill replace it and give an update.