ok so what happens to my car is when it warms up it idles fine.. but after it fully warms up the idle will bog down and come up but it will do it once. in another 20 seconds or so it will do it again, but it lets say the idle is at 2k it will bog to 1.5k and then bog again to 1k and then raise back up to 2k.. then it will sit at 2k for a while and maybe bog to 1.5k and then back up.. it's not like the normal problems where the idle constantly goes to 1k to 1.5k constantly.. this one has a pause between the bogs. sometimes my car throws a code 23 (knock sensor) but it turns off right away.. kinda flashes on and off but won't stay on all the time.. i think there is just a lot of vibration under the hood, but not positive. i have no clue what the problem could be? fuel? ignition? i already messed with those 2 valves on the intake manifold.. the spring loaded one which i tightened then the one on the back which i cleaned out really well with throttle body cleaner. any ideas??

 

a few weeks ago i cleaned the iacv real well with throttle body cleaner and it seemed to fix the problem, but maybe i didn't let the car run long enough to get to the point of the problem to happen again? i thought the problem was fixed.. could it hint that the iacv is bad?i would have thought cleaning it would keep it clean and not have it go back into this problem.

btw this car is never driven.. it just sits in a parking spot.

 

what ecu? pr3 or pw0
i have used each on the exact same engine and had different behaviors from each ecu.
codes don't help, but the IACV is a definite suspect.
vacuum lines are to be suspected, so i hear.