lt4 with high rpm miss

I noticed a side bar in this months issue referring to a high rpm miss on the new project car and was wondering if it had been fixed yet and if so, what the problem was.  

My problem...

My 1996 LT4 vette w/ 80k miles developed a little miss a couple of months ago.  I really didn't pay too much attention to it as I was already planning to do a full ignition change.  Well with the work complete (new MSD opti, MSD wires, MSD coil, MSD 6AL, plugs, module) I still have a (intermittent!!!) miss.  It only occurs between 5500-6500rpm (not the same rpm every time) lasts for a fraction of a second, and the engine keeps pulling to redline like nothing ever happened.  I have checked my connections, checked for arcing, bypassed the 6AL, checked fuel pressure, and beat my head violently against a brick wall, and come up with nothing !!

The car has had an intermittent rich condition since I bought it and I suspect leaky injector(s) and will be replacing them soon.  I hope that there could be a conection between the two.  I have completely run out of ideas and have consulted with a couple of old school mechanics and left them scratching their heads.  I should mention that the car is mildly modified...HOT cam (springs were supposedly changed too)headers, custom tune, bolt ons......

Please help!!!!!!!!!!!!!!  

Sounds like you need to scane it and see whats happening when this miss happends. Do you have datamaster?...if so get to lggin.    

An installation error on the harmonic balancer/March underdrive pulley caused my LT1's high rpm mis. Optisparks are very sensitive to crankshaft harmonics given their location and mechanics. There are several other possibilities that can cause a high rpm mis such as the valve springs, injectors and fuel pump. I addressed this in the new issue (hitting the stands in another couple weeks) and how I went about fixing it. The best advice I can give is (like already mentioned) to scan the computer and datalog using EFILive or TTS DataMaster. Thankfully your '96 has an OBDII computer, which has quite a bit of information available to you to help track down the problem.  

I know this is an old post, but my LT1 has the identical problem.  Did you solve the issue?