Engine Control Question

[Scott Feaver]

I have been monitoring my engine with diacom and have found out a few things
about it..  One of which leaves me wondering why...

Here are the details
91 Sunbird
3.1L V6 Engine
Automatic, 2.53 Axle

When speeding up from a dead stop at WOT, the fuel injector pulse width is
around 12.2ms.  Once it goes above 3700 rpm or so, it starts to slowly
decline until it hits 5200 (right before shifting).  At 5200 rpm the pulse
width is 9.8ms.  Why would this be?  Is this so the engine doesn't melt :),
or for emissions reasons.  If this stayed at 12.2ms right to the shiftpoint,
would this generate more power?

Also, this thing has the 730 ECM.  How many frames per second on this baby?
(I asked this before, but now know exactly what to specify :)  Has anyone
found out anything about the MEMCALs for this ECM?  I have the eeprom loaded
in if anyone wants to take a look..

Thanks,
Scott