993 tiptronic shift / rev problem. HELP

[gee04c]

Hi All, I have a 1997 993 varioram tiptronic. Under load (at half throttle or more) engine will cut out when shifting between gears. It cuts out for about 1-2 seconds changes gears and then revs back up to where it was. Only under harder acceleration.

I have changed fuel pump, fuel filter, knock sensors, plugs, transmission serviced.

Any suggestions or help would be greatly appreciated.

I haven't changed tiptronic computer.