Decelleration, High Idle .. weird stuff ...

[Sidewayzzz]

Alright, this KA is starting to piss me off (and I am an avid sr hater...).

Don't remeber exactly when it started but i'm having some weird issues on decelerattion and my idle is fucking erratic at best. The idle will be anywhere between 700-1100...it doesn't shift extremely fast between idle, its hardly noticable most of the time, but you can hear the motor change pitches while idling. I will just stop at a light and sometimes it will idle at 750 .. sometimes 900 .. most of the time 1000. This isn't a "searching" "hunting" type idle...it will usually come to 750, then rise to 1000 and you can hear it change pitches in the exhaust... and if you stare at the RPM's and watch very closely it will shift about 100 rpm's up and down. It's very hard to notice, but I think this is important with my decelleration problem so I want to note it.

On decelerattion my car will fall extremely fast to very low rpm's .. i'm talking 300-400-500 ... and it will come back up to 750 when I come to a complete stop then rise to 1000. It feels like an atmospheric blow off on a maf based turbo car almost. If I pull the car out of gear while moving the rpm's will fall to extremely low levels .. IE 500-600.. Very rarely, the car can die if I pull it out of gear to stop, or even coast. When I come to a stop it usually falls extremely low to the point it should nearly die, then the IACV brings it up to 750...then 1000. If i pull it out of gear while coasting, it usually falls to 500ish and stays there, until I come to a complete stop, then it rises to 750...then 1000.

Today I .. uh .. took an IACV from the junkyard and cleaned it up .. swapped it .. same problem exists.

I can have checked the ECU for codes and on a few occassions it did show code 33, which is the o2 sensor circuit.

I have 3 different o2's that I have swapped and tried, they are working fine, I just had to replace my o2 actually. I've tested the o2 via the ecu test, it's working as it should. Harness/Connector falls into the aforementioned state, if the harness/connector was bad, the o2 would not give a correct resule and that would be noticable in the o2 test.

I'm on my last straw with this motor ... any help is appreciated guys, thanks in advance.