[Jarek5_7]

yes it idles fine until driven. I swapped the iac and tried to reset it as in the book I have. its " corvette fuel injection and electronic management" by charles o. probst. it covers many efi on corvettes also zr1. its written there to press accelerator pedal a little and start the car for 5 sec then turn off the ignition for 10 seconds. I did that and havent notices any change. but now I see that its also written there that the reseting of iac is needed after unpliging the iac while engine is runing. I didnt unplug it on engine runing.
I will do that tommorow and then the reset procedure. Or I should reset it a diffrent way? also I will try to scan the car while driving tommorrow.

I really want to get this car into a good condition and high idle is I think the most annoying issue in it.

So far I changed for new injectors, plenum and tb gaskets, coils, wires, plugs, checked for vacuum leaks, havent found any yet.
( sec vacuum pump is working and sec vacuum system holds vacuum good, also the actuators hold vac and works good, the primary vacuum reservoir hold vac, I check also vac on the other side in the hose going to plenum it also holds vac)