my 91 L98 has an issue where under part throttle acceleration, the car will stumble and buck a little bit, then like a light switch it accelerates normally again. It seems to do this even when the car is cold and hasn't gone into closed loop yet, but I notice it the most after the car has warmed up and gone into closed loop. I've watched my scan tool while it does this and when it stumbles, my oxygen sensor voltage nose dives, down to 40-60mv. Likewise, in looking at my BLMs, it seems to be contained to a certain set of cells, but I don't know if it's related to those cells, or it's just in those cells because it happens under similar conditions all the time. In either case, after my new injector swap, my BLMs are mostly in the high 140s, with a few even in the 150s and a couple at 160 (22lb injectors my *** ), but in those cells where I'm getting the stumble, the BLMs range from 118 to 130.

I've changed virtually everything in the ignition, including plugs, wires, cap, rotor, coil, & ignition module.

I've had a fuel pressure gauge on the car while driving and it seems to stay rock steady. I noticed that I had one white plug and 7 black ones, and 4 of my 8 injectors ohm checked at under 16 ohms, so I put 8 new bosch "22lb" injectors in. I use quotes because my BLMs make me suspect that they aren't 22lb injectors, but that's another matter entirely.

The car is a 91 TPI 6 speed with a TPIS base, TPIS runners, stainless roller rockers (I assume 1.6 but I really don't know) and I believe it's also got a cam. It also has an Arizona Speed & Marine PROM, level 2 or level 3... I don't really remember.