Yeah, I am struggling.

I am going to try and do a smoke test tonight just to be sure of the vacuum leak problem.

To me it seams like some sort of electrical malfunction based on a sensor reading or something. If it was purely a vacuum leak I would expect high idle even on a cold engine. In this case it’s like the ECU is opening up the icv for no reason. Or... there is a leak and the icv is opening to make it what would be a normal idle without one.

I love these engines but there are so many places for a vacuum leak on CIS injection. I can’t complain too much though, it is a 28yr old car and I have had it since 2005.