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Hi, new here.

I have B5 RS4 which is somewhat flat and hesitant on occasions.

For no reason - its almost like the turbos are 'off' in one gear, then change and on they come again.

Sometimes its a little hesitant, and surges - but mostly its a constant flatness.

Only on rare occasions. A diag chceck reveals no error codes.

Any advice appreciated.

Thanks.

Possible EGT fault.

Did you use Vag Com?

looks like your egts or n75 valve