Hi has anyone had a problem on an AUY code 1.9TDi where the engine suddenly surges for aboout 1/2 a second every 5 seconds at about 2,200rpm?

1.9TDi, 2,200rpm.

The Turbo vacuum pipe to the actuator needed reattaching, and it's fixed most of the lacklustre power problems, but the car now surges in power at 2,200rpm.

Cheers,

-Andy.