i second nick on this. ive had many things tested including a starter and alternator. they both checked out fine when in fact the starter was toast and all that was working was the solenoid and the alternator had a blown regulator. it was showing 13.2 at the test and it was sky rocketting at high rpm's.
mine: 93 ZE, clutchmaster clutch, fidanza flywheel, poly motor mounts, HS CAI, HS headers, ractive exhaust, F&R strut bars, ground controls on illuminas, SS clutch line, espec heads/corners and much much more!!
hers: 93 ZE. pretty much the same mods. + F&R drilled rotors, STS, h&r's