ZR1 Full Power Issue

[402Z]

Hello everyone,

Just purchased a 1991 Zr1 with 41k miles on it last week. Absolutely loving the car so far and still cannot believe I own one. It sat for a while and it being 30 years old it does need a few things but the main concern here is full power mode.

In valet, it runs perfect no hesitations revs smooth up until about 5k of course which I know is normal since the secondaries aren't kicking on. Now when I put it into full power mode and put the hammer down, it sputters, hesitates and although it does rev to 7k it is not a smooth climb up there. The service engine soon light did pop up, but I tried to pull codes and nothing was there only "H" codes which I read are history codes that aren't present issues. I listened for the vacuum pump but I am honestly not too sure what it is supposed to sound like, I will try and attach a video or google drive link in here so you all can listen. I did unplug the vacuum line that goes from the secondary pump into the plenum I believe, but did not hear the pump running constantly with the ignition on? I put a picture of what vacuum line I am talking about

Is there anything that is relatively easy I can start with to diagnose the issue? Like replacing something small to see if that works? Let me know what you guys think the issue is would love to finally experience Full Power Mode in this beast. Thanks!

Here is the google drive link for the video of the secondary vacuum pump:
https://drive.google.com/drive/folde...rJ?usp=sharing