Anybody have some sound clips or something so I can hear the difference? My car has had a pretty hard miss/loss of power in the 1600-2000rpm area under light/mid acceleration, I think it's too rich but trying to figure it out. Over 2000 it very quickly gets on it and moves NB O2 goes to 0mV (sees oxygen since it's misfiring), I see no smoke coming out the exhaust, it's very boggy and sliggish, but I can hear loud popping in the headers (unburnt fuel burning in the headers?) Only changes I've made to the prom recently is to force open loop until I get this sorted out, the misfire is getting the '7730 all confused so it's corrections are just making it worse, BLM's all over the place Doubt it's an ignition problem (MSD distributor, 6AL, blaster coil, Taylor 8mm wires) -rebuilt 355, mostly stock bottom end -60cc al. bowtie heads (2.08x1.60) -Comp 12-466-8 cam, 1.5 rockers -ported TPI base, 24lb injectors, 48psi

I have a very similar problem. If I accelerate lightly it's fine. If I give it more throttle, it spits and studders from 1500rpm to 1800rpm. Cleans up after 2000 rpm. I added and removed timing from that RPM range with no difference. Datalogging shows me being rich when the studder starts, lean at the end of the studder, and lean for about 2 seconds when it clears up. Kind of confusing. I think I'm going to try and remove some fuel at the afgs/sec the studder starts.

Yeah that's exactly what mine's doing.

Went for a drive yesterday in forced open loop (while playing around with fuel pressure), it was worse, WAY worse. Barely even drivable on the highway (had to pull over and swap chips).

What I did was I forced open loop, then lowered my fuel pressure to 30psi

Ran pretty lean, as expected.

I then raised the FP in 2 psi increments until I found what made the engine run the best in that RPM range.

It was weird, I found no point where it ran well, it was an instant transition from lean to rich with no happy medium.

Pulled a few spark plugs, pretty black and crusty (rich)...

I've definitely got an oil consumption issue though, it eats a quart every 2 weeks...

I need to do a compression test and find the source of the oil entering the cylinder(s) (cylinder walls or valve guides?)

Well I pulled some fuel and it's 80% gone. A little more tweaking and hopefully problem solved.