I haven't used the Powerjection 1, but on the Powerjection 3 there was a computer program update that got from Retrotek that changed the whole demeanor of the system.
The one I had wouldn't start cold, it was fussy at part throttle, and after the download it was night and day. Many different parameters added and felt like it gained 50 ft lb on a mild 350, in addition to a modern cold start. Matter of fact, I did the update in a parking lot and it ran so much better immediately that we never went back and did any adjusting, we just drove it.
Here is a very good tech name
Cody LePenske
323-599-5032 ex. 1204
[email protected]
I can't find the link I had, but figure out the program release you have and ask Cody for the new one. They are currently up to release 2.1 I believe, and it is far better than the 1.x series