Got a good puzzle....

[relaxamigo]

I've been battling this issue for a little over a month now. I was on track and the car all of a sudden lost power. The engine would rev smoothly, but it wouldn't "go." I know it's just a KA, but the power loss was absolutely noticeable. The alt also died that day, and was replaced the next morning.

If I shut the car off, wait a little, and go drive again, the car can get one or two strong pulls before it loses power again, the engine didn't cool down all the way, it was still warm. Stock KA with emissions deleted, walbro 255 and tomei FPR.

Here's what I've tested:

Fixed 3 vac leaks
Fuel pressure in and out 35 at itle and 42 at WOT
Stethoscope and voltage tests on injectors
Swapped a new walbro 255 (thinking it got hot under load)
MAF tested
TPS tested .49 volts at idle and 4.21 at WOT
leakdown/compression tests all solid 175 psi on all 4 and a 3% leak
coolant temp sensor tested in three different temps of boiling water according to FSM
swapped ECU
plug wires/cap/rotor/ignition coil/plugs all checked and gapped
AFRs are 11s at WOT and low 14s cruising
Only known issue is my IDLE afrs are crazy rich at mid 12s
replaced CAT with test pipe
replaced o2 sensor

This issue is driving me totally insane. Keeping the car sideways on track requires some seriously aggressive driving and I want it back to normal. Like I said, it revs freely with no sputtering but it just doesn't go. I've read tons of threads on similar issues all to no avail. I don't understand how I can get good AFRs at wot and the car still doesn't get power.

If you took the time to read this, I appreciate you, hopefully someone can help!

Thanks