Trying to flush out of there is any reason to favor a SEFI ECM over MPFI.

SEFI fires each injector once per 720*? MPFI fires all injectors or a bank of injectors once per 360* or once per 720*? Aside from emissions is one inherently better then the other? I had a 94 3.4 DOHC (SEFI) that I had converted to the 93 '9396 (MPFI) and it idled and ran much smoother with the 94 ECM then it did with the 93 but there was also the addition of the 24x crank sensor and MAF vs MAP differences to so the better idle quality might be attributed to something else.

In the $2e code I cannot find where it switches to batch fire after a certain RPM, just under 450rpm for cranking. Am I just overlooking it or does it run SEFI all the way up the RPM range? I seem to remember that SEFI switches to MPFI at 3k RPM.

As far as emissions, the 3800 ran on a SEFI ECM from the lat 80's onward. Does anybody know of a reason why this was done when the emission standards pushing for SEFI didn't really come into full swing for at least another 5-6 years?