[Michael Beard]

I take a boatload of fuel out of it yesterday at low rpm through launch rpm, and a little in the burnout area of the fuel map. Went a smidge too far right at launch rpm on the first run, but just a little tweak got it to leave cleanly again.

Going back over notes, I'm having to run this thing richer now than I did last month, just to get it to go down the track. If I take any fuel away from it, it quits making power (never pops like being too lean with a carb -- it just noses over.) A/F around 11-11.5 during most of the run, a couple spots in 2nd or 3rd gear where it gets into the low 12's, but now I've noticed a couple of rich spikes (10+, not prolonged, just at a singular point on the data log, one in 2nd gear, one in high gear... only did it the last couple runs)

Something I've noticed from day 1 is that the rpm doesn't come up smoothly, and it seems more pronounced now as time goes by. It'll have just an instant of a drop of as much as 300 rpm here and there... fluttering off and on. Shows up more in the data log than what you can feel in the car. This weekend, at least with the borrowed 4-hole spacer, even at idle it was moving around.... 1000rpm for a second or two, drop to 600 for a second or two, then back up, back down, etc.

Theory: bad injector? One or more injectors not working properly, causing the intermittent rpm surge, which has me richening up the whole system too much trying to compensate for poor or surging flow on just 1-2 cylinders, then being down on power when I try to lean it out?

We're going to try to do some kind of injector test tomorrow.