Another note:
I've beaten this dead horse a few years back but I may as well tell it again.

My blasted windshield rubber was leaking and it permitted windshield wiper fluid to leak ONTO my TWELVE HUNDRED dollar computer, rendering its little ground wire at most, ineffective.

(Make sure your ECM is properly grounded, even if it means you have to run another ground wire. Look for the telltale signs of crystallized, dried windshield washer fluid around the ECM and nearby wiring.)

1991 4dr RS, ATK 3.0, auto. Now with zero trans fats!