IAC counts high

[dhworkin]

And way too much fuel pressure. I'm guessing the ECM was trying to lean it out to the point it was shutting the injectors off at cruise.

Yep, it was like turning the key off except it still had brakes and steering.
I had a slight hesitation with FP at15 psi so I dropped it to 13.5 and never had a problem when I drove 120 miles today.

 

[Scooterwrench]

I'm running 14psi,that's where I ran off the end of the adjuster screw. The best way I know of to determine optimal FP is to try to achieve 85% injector duty cycle at WOT.

 

[PlayingWithTBI]

The best way I know of to determine optimal FP is to try to achieve 85% injector duty cycle at WOT.

And watch your WBO2. A little story; With my EBL, I tried 454 injectors @15 PSI in my 46mm TB. I set it to run "Learn VE" where the ECM adjusts AFR based on the WBO2 (you can run it on a NB2). While driving around, it ran OK with lower Injector Duty Cycle than my 61 LB/HR at 18 PSI. Then I pulled up to a stop sign, with engine fully warmed up, the EBL shut off the injectors totally, then would open them, then close them, rinse and repeat. That's when I went back to the 61LB/HR and 18PSI spring @ 20PSI - idled fine and ~90 VE (12.5 AFR, a little rich) at WOT and 5300 RPM in 2nd gear, good enough!

 

[dhworkin]

And watch your WBO2. A little story; With my EBL, I tried 454 injectors @15 PSI in my 46mm TB. I set it to run "Learn VE" where the ECM adjusts AFR based on the WBO2 (you can run it on a NB2). While driving around, it ran OK with lower Injector Duty Cycle than my 61 LB/HR at 18 PSI. Then I pulled up to a stop sign, with engine fully warmed up, the EBL shut off the injectors totally, then would open them, then close them, rinse and repeat. That's when I went back to the 61LB/HR and 18PSI spring @ 20PSI - idled fine and ~90 VE (12.5 AFR, a little rich) at WOT and 5300 RPM in 2nd gear, good enough!

When I had the FP to high the same was happening except right before it got to rich to stall out the ECM would pull it back and the idle was up and down.