If your 3800SC is having high RPM fuel issues, it should be verified. The easiest way is with a wideband O2 sensor. You can buy portable units that clamp on to your exhaust pipe to take readings. That's what we use.
If the engine is confirmed as running lean, the next step is to monitor fuel pressure when it goes lean. IMO all boosted engines should run a fuel pressure gauge to check on how the supply is doing. If the pressure drops below about 40psi + boost its a defective pump or regulator. BTW do you have the proper Bosch 3 bar regulator on the fuel rail?
------------------ " THE BLACK PARALYZER"
-87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 06-07-2014).]