Flat spot on acceleration. No fault codes. Lambda sensor and coilpack replaced before I got to scene.

Scoped both throttle sensor and MAP, all seems OK (But tried new MAP just incase)

On driving round the block the "Lurch" always seems to take place at about the same place (So it is linked to specific load/speed conditions)and it is possible to drive through it.

(the rev counter needle stays steady during the lurch)

I cannot reproduce the symptoms simply by reving the engine while stationary

ISTR that there were some ECU issues on these but cannot seem to find any info.

Any suggestions??