I figured out my problem today. Whoever worked on this thing last, left a ground wire unhooked. It was the one coming right out of the harness going to the injectors under the plenum. I hooked it up and it runs perfectly now. Only thing I can't figure out is why it ran at all?!

 

Maybe the ground was backfeeding on some other circuit. Just enough ground to let it run, but not enough to run right. Just a thought...