Help!! Stumble/Cut at 5000 RPM

[jlevie]

Check the WOT switch in the TPS. If it is bad performance will be badly down above 5000rpm.

[Purplehazedog]

Okay guys, need your help. I missed my SPEC E30 race on Sunday because I could not get my car to run.

Here's the problem:
My car would Stumble/Spudder at 5000 rpm. I could not get it to REV past 5K.
This is the second time this has happend and both times the car will run fine on Saturday, but Saturday night and Sunday its starts the madness!

My Crank Sencer was Frayed From the belt, When I replaced it with a good one (From a donor car) My car would just cut out at 5000. It is a sudden cut of power. I was able to race when it was spuddering at least, but I was stuck in last place.

Here is what I replaced to try and fix the problem:
Coil
Cap
Rotor
Fuel pump
Fuel filter
plugs
Plug wires
ECU
tested Battery
AFM
Air Filter
Adjusted valve lash

I have no Idea what to try next, Has this happend to anyone else? What do I do next?

Thanks!!