You won't stop getting the EGR code because of the fact that you installed the non-egr manifold, The 97' and up Vin S motors uses the Mass Air Flow sensor to detect that the EGR is opening. You can't just unplug the Mass Air Flow sensor.
The easiest way to stop getting the code is to get another Computer from any vehicle, 98' and up that has the Vin F engine and the same drivetrain (2wd or 4wd).
You will need to perform a passlock relearn when you install the new computer.
The other option you have is to send your computer to JK or Heath and have it reflashed to Vin F specs with some tweaking.
William
97 Chevy Tahoe 2Dr 6.5 Kennedy Exhaust Pipes w/Homemade Resonator and Flowmaster Muffler, Turbo Tech intercooler and Kennedy/Westers computer
01 Sunline 2363 Travel Trailer