Valet key switch issue

Originally Posted by TonyTZR1

Hello;

I am new to the site. I just got a 1990 ZR1 and have a question concerning the full power and valet key. The car runs great until put into the full power mode, then it runs crappy. I have no idea what to look for or where. Would appreciate it if someone could give me some direction. I have owned several Corvettes, but not a ZR1.

Thank you

Tony

Tony, I'm guessing when it runs poorly it's when you are WOT. If that is the case, I will go out on a limb andsay your secondary injectors have not been exercised enough and are gummed up.