I get one weird fuel issue after another! The latest one: If I'm cruising on the freeway, and barely accelerate (maybe will get to -1 PSI, but still stay in vacuum), car will go into open loop (per the scangauge) and the AFR will drop to 10.0 and just stay there. It's not a false reading from the wideband, as the EGTs drop too and therefore confirm the AFR readings are true. The car will just remain in open loop, and the AFR will remain at 10.0 endlessly unless I take my foot of the accelerator briefly, at which point it will go into closed loop and resume running at AFR=14.7. Car still runs okay when it's doing this, there is no bucking or hesitation, but power is diminshed.

I'm running 440s, with fuel pressure of ~22 psi while cruising (they remain stable during the open loop event), EGR is unmolested, new MAP, new CLT, no apparent vacuum leaks, symtech FCD, and zero CELs. Any ideas? I need to fix this before it kills my cat.

2gnt: '99 RS-T, killed by a toyota, pending rebuild...
Daily: Volt
Daily #2: '99 EVG ebike- STOLEN by PEDRO