idle drop and shake with ac or heater.

[tmorales509]

So my car idles normal around 750-800. But when i turn ac on the idle drops to about 500-550 along with shaking. The idle does not adjust itself, it stays down until i turn the ac off. Also the heater does this but only if i put the heater on defrost, if i put it on the front vents or the lower vents it does not do this. There is no voltage drop just the idle. I know that is it normal for a little idle drop but up to 200 with shaking and the idle doesn't compensate i think is not normal. I have changed the iacv with one i got at the junkyard. Im sure there is a small chance that that one may be bad but i don't think the odds are that great are they?

[NutriaforBreakfast]

Just guessing here

On the 1995 model there are seperate mechanisms to keep the idle stable
when the AC is on and when the power steering is being used.

You might check the shop manual in the area related to the throttle position sensor.
Seems like it is 3 connectors in a row next to each other close to the throttle body

I think if it was the IACV the rpm would be constantly changing up and down

[tmorales509]

It was the idle air control. I cleaned it before and it didn't help but i decided to take it apart again which it did have some build up on it so i cleaned it again and the problem went away. Thanks for the input though.