Well this topic could not have come at a better time.
I raced at Laguna Seca last weekend and experienced limp mode and high RPM breakup (at different times) in my 89 ITS for most of the weekend. I changed coils, CAS, ECU, AFM, plugs and wires. Only to have these problems come up at different times during the weekend.
I ended up turning the key off then back on while driving and the problem would clear up until the next lap at the same spot.
I had the fastest lap of the weekend for ITS by .78 seconds, just could never get the car to run clean for a whole session.
Now I at least have an idea of where to turn.
Thanks for the info.

Charles Buzzetti