Don't give it the beans that much but the other day I was reving it hard and noticed a sudden loss of power for a second or two before it came back. Tried it a few times and it doesn't always happen. What could be up? Breaking down injector? It has a shark map on it that's been on for 3 years problem free.

Forgot to say it's a vrs cr

Am I right in saying there's no more power after 4k anyway? although shouldn't loose any

No with it being mapped it's still pulling, once it gets over the flat spot it carrys on a little before the next gear is needed.

possible boost leak ? 

Edited 18 September, 20169 yr by willy0329

Would a boost leak do it only every now and again though?

Sometimes when a hose flexes on hard acceleration it can move look for any light oil residue on boost hose connections I know on the pd170 the actuator vacume line can leak,or a dirty egr valve can cause boost hesitation, just some ideas.

Did you find out what the problem was mate? I have the exact same problem and engine