I just purchased a 1989 Iroc from the Family of the now deceased owner. I know little about the history of the engine or the tuning.

The engine appears to be a reman block from aarons automotive in MO , there is a tag on the side of the block with a serial number.
The heads are edelbrocks , the intake has non oem runners , car has headers and exhaust , car has a cam , holley throttle body , paxton sn 2000 blower , red injectors and a billet rail with adj regulator.

The problem is the car runs extremely rich once warm and the idle rises from the blower pushing the throttle blades open? Car came with a new grantelli adj mass air and a shop bill of sale saying it needs installed along with two vacuum canisters for the brakes?

Something is not right because the engine does not pull vacuum at idle , its right at 0 hg or even pos pressure?

I am going to take pics and come back with more information.

Whats the deal with this supercharger system doing this?

N/m I think I got most of the issues solved today.

How did you fix it? I am in the proses of installing a sn2k.

Well for now as a crutch I installed the adjustable mass air that came with the car , was in the backseat new in a box, and that helped it from running so rich and picked up power but it still needs tuned. I am guessing PROM and wideband.

What is the normal thing to do , is it worth sticking with mass air?

What most ppl do is switch to MAP, and learn to tune. Steep learning curve there. I think I will be doing the same as you. Ajustable maf, and a fmu. Did you run a second pump and the meth injection?

Also get a af reader, even if it is a cheap one that will conect to your NB-O2.