[200q20v] Misfire at 4800RPM???

[Chaplen, John]

I have a friend that also has a 91 200 20vt, but his starts missing at above
4800rpm.
He's changed the plugs, cap. timing has been checked, and had the throttle
sensor replaced. 

To note, it will misfire from just throttle depression (no boost, just
sitting in the driveway).

He says the car runs fine otherwise, gets full boost, just misses above
4800?

Any clues would be appreciated.

Thanks

JP Chaplen


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