AIC Issue?

[BXSS]

I have a '94 L-SS that is suffering from an unstable idle (750-500RPMs) when warm.
Vacuum decreased from 19inHG to 15inHG & I thought I had a decrease of compression in 1 CYL (#2 from 180-160psi).
The car runs perfectly as soon as I step on the gas & will hold a steady idle if I give it a bit of throttle.
I checked for Vac. leaks with carb cleaner - none found.
Does this sound like a bad AIC?
I bought an EJ20G to swap in, but would like to hold off on that until it gets a bit warmer if possible.

[gto7419]

Is it worse when other electrical circuits are powered? Basically, does it happen when you step on the brake, turn the radio on, or use the power windows?

My car has a very similar problem, and I believe it is because the electrical system is too heavily taxed.... Basically, when I grounded my new headunit very well, the engine started to idle low/stall when I used it and/or stepped on the brakes, etc...

I am no electrical engineer, but I do believe, like everything else, power flows through the path of least resistance. - Add proper grounds and you might see some significant improvement...

I've been too lazy to do the grounding mod - I might just wait until my new motor goes in...

Danny

[BXSS]

Nope, it just happens when the car is warm.

[gto7419]

Nope, it just happens when the car is warm.

Happens to mine when the car is warm as well. When the car is cold, the ecu idles the engine a little higher - therefore no stumbling...


Danny