Thank you! I was thinking about buying a pcm from zzp for my 98 gtp, but after reading all this I will be looking elsewhere.
Can anybody make suggestions where to get a good pcm?

I have few mods so far,
zzp o2 Emulator, cut off the cat, and resonator, front and rear
Lateral Arms, and Trailing Arms from exotic performance plus, and 18's with 245/45's.